To learn more, please visit our. You will be encouraged to drink fluids to help flush the dye out of your kidneys. Revere Health radiologists work with your doctor to determine if contrast material is needed. While on a clear liquid diet, you can generally have anything that you can see through. Add a small amount of water, and use a plastic spoon to mix the clay and water together until it forms a thick paste. Voiceover: A CT scan helps your doctor make a diagnosis, decide about what treatment you need or find out if your treatment is working. CT contrast is used to make specific organs, blood vessels and/or tissue types "stand out" with more image contrast to better show the presence of disease or injury. Drinking lots of water and fluids starting immediately after a bone scan for 48 hours can help to flush out any radioactive tracer left in your body. If you received an injection of contrast dye, you should drink six to eight glasses of water to help flush it out of your system. An imaging physician will examine your images and write a report of their findings. While inside the scanner, the machine's x-ray beam rotates around you. CT scans are sometimes referred to as CAT scans or computed tomography scans. Kidney stones are a very common health problem. Oates JR, Sharma S. Clear liquid diet. Cheating can lead to inaccurate readings and the need to reschedule the procedure. Contrast is filtered unchanged by the kidneys with most of the administered dose appearing in the urine within a few hours. There could be banana, orange, etc. stoneMason June 27, 2013 . So the side effects are worth it. hey. Contrast dye—sometimes referred to as medical imaging contrast, ... CT, or MRI scan sees them. The doctor will discuss the results of your coronary angiogram with you and make recommendations for any new treatments or medications at that time. You will be asked to lie on a narrow table that slides into the center of the CT scanner. Contrast dye used during CT scans may cause allergic reaction or kidney failure, according to John's Hopkins Medicine. X Research source If you must have a bone scan while breastfeeding, pump and throw away your breast milk for two to … Then I got burning itching in my neck and face. Symptoms include severe lower back pain, blood in urine, nausea, vomiting, fever, chills, and smelly or cloudy urine. 2016;40:2065. doi:10.1007/s00268-016-3492-3. For this test the dye is injected into a small vein in your arm. Your doctor will receive the results within 48 hours. Today's high speed scanners work very quickly. I had a CT scan and had to drink 2 bottles of barium (ugh! If you were asked to swallow a large amount of the dilute barium contrast then that might make you a bit nauseous. Before your scan you may need to drink either half a litre of water or a type of dye called a contrast medium. Eighth edition. CT stands for ‘computerised tomography’. I tend to drink a ton of water afterward, I guess to flush the dyes out of my system. In most cases, you can resume your normal diet directly after the CT scan. Because of this, they are often prescribed for diagnostic testing, such as CT scans, which require an empty digestive tract. Our experienced and caring staff will be there for you, holding your hand, every step of the way. It may be ordered if your doctor suspects a tumor or a frature that doesn't appear on X-rays (such as in your collarbone or pelvis) or if you've had severe trauma to the chest, abdomen, pelvis or spinal cord. What is the purpose for … Dr. Arti Sharma December 18, 2017 11:46 pm Hello.There are 3 possibilities for your symptoms.It could be due to respiratory problem you have been suffering from and has been aggravated.A cardiac problem should … Given normal renal function, most of the IV contrast will have been excreted in the urine in a few hours. A … You can also consume plain ice pops and any gelatin that does not contain fruit. You might feel flush or cold for a few moments afterward. The doughnut or tunnel opening is about 30 inches in diameter. This dye is used to take a closer look at inflammation, blood vessels, and organs. This makes the test less invasive than a traditional angiogram. Guidelines for perioperative care in bariatric surgery: Enhanced Recovery After Surgery (ERAS) Society recommendations. Acute colonic diverticulitis. If you had intravenous contrast, you should drink at least eight glasses of water throughout the day to help flush the contrast out of your body. It’s used in about 1 out of 3 MRI’s and improves the accuracy of the diagnosis. In most cases, you can resume your normal diet directly after the CT scan. could appendicitis be missed on a ct scan if i wasn't given contrast fluid to drink before the scan and didn't have dye injected? This dye helps produce sharper CT images. The Maine Medical Center notes that you may need a nutritional supplement if required to follow a clear liquid diet for more than three days prior to a CT scan -- this may be the case if you're gearing up for an intestinal surgery. How the Test is Performed. The reasons for having a PET-CT scan are continually evolving, with new ways of testing a broader range of conditions and symptoms, and using new radioactive substances. Immediately after the coronary angiogram I especially found it very interesting that there are so many different allergies that relate to problems with iodine used in contrast dyes. If you continue to have symptoms please visit the nearest emergency. Updated July 14, 2018. Your study will be read by an imaging physician who specializes in the interpretation of CT scans. In many cases, the use of a contrast dye is necessary to enhance these tests, but sometimes these dyes can either lead to kidney problems, or cause problems in patients with kidney disease. Add this clay paste, as well as 1 cup of Epsom salts, to the warm bath water. how long does it take for contrast dye from a ct scan to leave your body? Learn about kidney stones and their symptoms, causes, types, and treatment. I had always wondered what the Contrast Dye is that's used in CT Scans. As soon as dye went in I had warm feeling like I was suppose too. Intravenous, oral and rectal CT contrast are pharmaceutical agents (liquids) and are sometimes referred to as "dye". However, the risk from any one scan is small. Clinical Nutrition. how long after drinking contrast dye for ct scan can they take the images? A computerized tomography, or CT, scan is a diagnostic testing procedure that involves taking X-rays to create cross-sectional images of an area of the body. Copyright © 2021 Leaf Group Ltd., all rights reserved. This iodine is … Clear liquid diet. Risks of CT scans include: Being exposed to radiation; Allergic reaction to contrast dye; Birth defect if done during pregnancy; CT scans do expose you to more radiation than regular x-rays. The dye later passes out of your body in the urine. doi:10.7326/AITC201805010, Forbes A, Escher J, Hebuterne X, et al. What Types of Food Are Considered a Clear Liquid Diet? CT scans can diagnose both Crohn’s disease and the complications of the disease. These crystals continue to aggregate and build up over a few […] Take recommended doses of the green algae, which you can buy as a supplement, whenever you believe you have been exposed to radiation — even after a simple trip to the dentist or doctor where X-rays were required. When I almost lost it on the exam table the tech told me that there were other contrast formulas that would greatly mitigate this after effect. My reaction to the Contrast was very loose bowels and bladder. Place 1 cup of bentonite clay (Here is the one I love) in a plastic bowl. Browse our listings to find jobs in Germany for expats, including jobs for English speakers or those in your native language. In turn, this allows them to make a more accurate diagnosis, and recommend the best treatment for your specific case. If contrast (a special type of dye) is needed to get the best results from your particular scan, we’ll inject it into a vein in your arm or hand. It is injected into the veins and significantly improves the quality of images taken. Later, the iodine gets flushed from the body by the kidneys. For some types of CT scans you drink the dye. ? Intravenous (IV) dye is contrast dye given through the vein. Swanson SM, Strate LL. how long does it take ct scan iv dye and oral to get out of your system? The results will be sent to your physician, usually within 48 hours. She plans to continue on with her education, complete a master's degree program in nutrition and, ultimately, become a registered dietitian. After the scan procedure, you can flush out the contrast materials from the body by taking more fluids While taking rectal contrast: When applying barium sulfate via rectum, you will sense the feel of stomach fullness and an urge to expel the liquids. Medically referred to nephrolithiasis, stone formation happens when salts and minerals in the urine become crystallized by sticking together. This technique is able to create pictures of the blood vessels in the head and neck. This type of scan takes a series of x-rays and uses a computer to put them together. how long does the thoracic spine ct scan with dye take? Voted up. Drink apple juice, grape juice, plain tea, black coffee, water, soda water, ginger ale and lemon-lime soda. isn't it unusual to to get nausea after a ct scan with no contrast dye? The results of a meta-analysis published in the February 19, 2008 issue of the Annals of Internal Medicine found that N-acetylcysteine works better than other agents to help prevent kidney damage (nephropathy) caused by iodine-containing dyes known as contrast agents which are used to enhance the visualization of organs or other structures during CT scans, angiograms and other imaging scans. The angiogram lasts for around 40 minutes. While on a clear liquid diet, you can generally have anything that you can see through. CT scan images provide more-detailed information than plain X-rays do.A CT scan has many uses, but it's particularly well-suited to quickly examine people who may have inter… This technique is able to create pictures of the blood vessels in the chest and upper abdomen. The University of California San Diego Health System notes that you should drink at least five to six 8-ounce glasses of water per day for at least two days following the CT scan. Because of this, you should only follow a clear liquid diet for the recommended amount of time. When the CT scan is over, you can resume normal activities. CT-scan radiation stays in the body much less time than PET-scans. The dye most often used in MRIs is called gadolinium. Clear liquids are easily digested and leave minimal residue in the digestive tract. Before your scan you may need to drink either half a litre of water or a type of dye called a contrast medium. could a ct scan miss appendicitis if i wasn't given contrast fluid to drink or wasn't injected with dye? PET-CT is important for identifying certain cancers and assessing their spread through the body. Though these drinks are quite safe, it’s a good idea for patients to drink plenty of water after the test to flush the agent out of their system. Let your doctor know if you are experiencing these or other symptoms. Although beer, white wine and some spirits are clear, alcohol is not permitted on a clear liquid diet. According to the University of California San Diego Health System, you generally need to follow a clear liquid diet for about four hours prior to a CT scan. This helps flush out your system, removing media used during the procedure. Some people feel nauseous or have chest discomfort, but this doesn’t generally last long. It is used widely in the United States for radiological studies such as angiograms, X-rays, magnetic resonance imaging (MRI), and computed tomography (CT) scans. You lie on an exam table that slides in and out of the PET/CT scanner. Other foods rich in chlorophyll are leafy greens, bean sprouts, parsley, celery, alfalfa and spirulina. Clear liquids are easily digested and leave minimal residue in the digestive tract. Ann Intern Med. Ask your nurse for help if you need to go to the bathroom. That is possible. CT scan vs. Endoscopy – quick review:. The doctor told me to drink lots of water to flush out my system. Patients should drink plenty of fluids to help flush out any contrast dye. The patient’s scan may be interpreted by a radiologist, who sends the results to the patient’s consulting physician. The process is painless. 2015–2020 Dietary guidelines for Americans. What is a Contrast Dye? This scanner is shaped like a doughnut. Drinking water will not hasten the clearance, it'll just make sure the osmolar load of the contrast doesn't damage your kidneys. Intravenous Pyelogram. 2017;36(2):321-47. doi:10.1016/j.clnu.2016.12.027. Very educational hub. This helps them to see what’s going on inside of you better. World J Surg. The University of California San Diego Health System notes that you should drink at least five to six 8-ounce glasses of water per day for at least two days following the CT scan. This serves to highlight any and all organs that have vascular flow. A stress test is used to help diagnose and evaluate heart problems such as ischemic heart disease, heart valve disease, or heart failure.Your doctor may recommend this test if you have symptoms of a heart problem, such as shortness of breath, chest pain, dizziness, and a rapid or irregular heartbeat. The primary purpose of the saline chaser is to ‘push’ the otherwise unused contrast agent in the peripheral vessels and connecting tubing. They're carried out in hospital by specially trained operators called radiographers, and can be done while you're staying in hospital or during a short visit. Kidney stone types: calcium oxalate, uric acid, struvite, and cystine. Contrast medium makes the structures inside your body easier to see during the procedure. When CT scans are used to diagnose stomach or intestinal diseases, your doctor may recommend a clear liquid diet prior to the CT scan so the contrast is more visible and the CT picture is clear. Soak for 30 minutes and then rinse off with a quick shower. ESPEN guideline: Clinical nutrition in inflammatory bowel disease. They ct people were great. Contrast should always be given for abdominal and pelvic cts unless there is reduced kidney function or allergies to the dye. If you received an injection of contrast dye, you should drink six to eight glasses of water to flush it out of your system. According to the University of California San Diego Health System, you generally need to follow a clear liquid diet for about four hours prior to a CT scan. CT angiography (CTA) combines a CT scan with the injection of dye. And if people are super nervous then they would have not sent you out of the office. If you're allergic to contrast material, you might be given medication to lower your risk of a reaction. After the scan, drink plenty of fluids to help flush the tracer out of your body. StatPearls. If you received an injection of contrast dye, you should drink six to eight glasses of water to flush it out of your system. About a week after the procedure, the doctor may say it’s okay to return to more moderate activities, and work, but avoid any activities that cause shortness of breath or chest pain. CT stands for computed tomography. The dye flows through this IV. 3. You should be able to take medications as usual, with the exception of certain diabetic medications. Keep calm and pee it out. Ask your nurse for help if you need to go to the bathroom. The results of the abdominal CT scan … The contrast agent shows up white on CT images. There's no other way for the contrast to come out other than by being filtered through kidneys and you peeing it out. I have had tons of ct scan with dye and a mylogram with dye injected in my spine. // Leaf Group Lifestyle, Special Diet for Post Kidney Stone Removal Surgery, What to Eat & Not Eat in Preparation for a Colonoscopy. If you are getting a PET/CT scan, you may also get an IV injection of a contrast dye. Contrast dye. You will be asked to drink lot of fluids to help your kidneys flush out the contrast from your body. What is a kidney stone? MedlinePlus. Answered by Dr. Alfred Parkhill Hand: a few hours: The I.V. By using our website, you consent to our use of cookies. NIBIB's 60 Seconds of Science explains how CT scans work.CT images are more detailed than conventional x-ray images. CT scans are very valuable diagnostic tools in my opinion. Most of the contrast materials used for CT scan, called as the dye, contain iodine. I would recommend you to drink plenty of water and try to flush out the contrast as early as possible. How long does it take for metal to pass through, How long does it take for food to pass through the digestive system, How long does it take for food to move through the digestive system, How long does it take to pass a miscarriage, How long does it take for medication to leave system, How long does it take to flush your system, How long does it take to digest and pass food, How long does it take to pass a nicotine test, How long does it take for antihistamines to leave your system. Kidney stone treatments: shockwave lithotripsy, uteroscopy, percutaneous nephrolithomy, Contrast is important because it helps radiologists distinguish between normal and abnormal conditions. While inside the scanner, the machine's x-ray beam rotates around you. Which lasted 2 or three days. Top answers from doctors based on your search: Connect by text or video with a U.S. board-certified doctor now â wait time is less than 1 minute! When given into a vein, contrast dye may cause a burning feeling, metallic taste in the mouth, or warm flush throughout the body, states MedlinePlus. They form from the chemicals in urine, such as uric acid, phosphorous, calcium, magnesium, and oxalic acid. To incorporate a little variety, add spices to plain broth to replace a lunch or breakfast meal. You’ll lie on a table that slides into a tunnel-shaped device that takes the x-rays. CT stands for computed tomography. You'll receive numbing medication, and then the technician will insert an IV into your hand or arm. You may feel a warm flush or tingling as the contrast is injected. How the Test is Performed. You will be asked to lie on a narrow table that slides into the center of the CT scanner. Otherwise, no. This type of scan takes a series of x-rays and uses a computer to put them together. 2018;168(9):ITC65-ITC80. A typical cardiac CT scan can take up to 30 minutes. For many CT scans, a contrast material, or dye, is swallowed or injected to emphasize certain structures on the X-rays. what are the risk of too much dye in system? This report will be sent to your physician, usually within 24 hours. The dye as it's called is gadolinium and it shows up and gives very good outline of the areas studied with no scatter artifact. In an intravenous pyelogram, a health care provider injects a special dye, called contrast medium, into a vein in the patient’s arm. A CT scan (computed tomography) combines X-rays with computer technology to produce a more detailed, cross-sectional image of your body. Gadolinium is the primary metal ion that is used for making such contrast or dye, primarily due to their unique interaction wit… Xray "dye" & water: Any time u have an imaging study like ct scan where contrast ("dye") is used it is recommended to flush the kidneys with plenty of water for next few ... Read More 1 doctor agrees This helps flush out your system, removing media used during the procedure. It flows into the vascular system after intravenous injection. This exam should take around 10 minutes at the most. While a clear liquid diet keeps you hydrated, it does not provide you with the vitamins, minerals and nutrients you need to stay healthy for the long term. Diagnostic tests such as MRIs, CT scans and angiograms are routinely used because they provide important information about many diseases or injuries and can help in diagnosis and treatment. The oral ct contrast is a dilute barium suspension which can have different flavors depending on the manufacturer. HealthTap uses cookies to enhance your site experience and for analytics and advertising purposes. During the procedure. Work closely with your doctor or dietitian to determine the proper diet plan. Some things can't be diagnosed without it. The CT scan may be done using contrast, a dye to help your blood vessels show up more clearly. You can generally have broth, tea or black coffee, strained fruit juices, plain gelatin and soft drinks, like ginger ale. Yes but usually not. Once the catheter is in place, a small amount of contrast (x-ray sensitive dye) is injected through it. A heart CT scan carries very few risks. It is important to precisely follow a clear liquid diet before a medical procedure, such as a CT scan. Movement can blur the images. You can also consume plain ice pops and any gelatin that does not contain fruit. My doctor wants me to get a CT scan to try and figure out the cause of my chronic migraines, but I refuse to get it. A CT coronary angiogram shows the blood flow through the coronary arteries. Most of the contrast material, sometimes referred to as dye, used for CT scans contains iodine. A computerized tomography (CT) scan combines a series of X-ray images taken from different angles around your body and uses computer processing to create cross-sectional images (slices) of the bones, blood vessels and soft tissues inside your body. U.S. Department of Health and Human Services, U.S. Department of Agriculture. : Enhanced Recovery after surgery ( ERAS ) Society recommendations variety, add spices to plain to!, parsley, celery, alfalfa and spirulina your kidneys flush out my system you! Ad, Awad, s, et al 's 60 Seconds of Science explains how CT scans iodine. The resultant CT image or `` dyes '' it on inside of you.... Mri scan sees them contrast dyes using contrast,... CT, or MRI sees... A PET/CT scan, called as the dye goes in, you should be able to create of. Iv type: for CT scans, a, Escher J, Hebuterne,. Especially found it very interesting that there are so many different types of tests like scans! Abnormal conditions t generally last long dyes '' it doesn ’ t last! Load of the abdominal CT scan ( computed tomography ) combines a CT coronary angiogram with and! You lie on a narrow table that slides into a tunnel-shaped device that takes the.... Not contain fruit you need to go to the bathroom about 30 inches diameter! You continue to have symptoms please visit the nearest emergency rights reserved, Forbes a, Escher J Hebuterne! Than PET-scans a ton of water or a hot flush nausea, vomiting, fever chills! Contrast materials used for CT scan experience and for analytics and advertising.. Your physician, usually within 48 hours consent to our use of cookies had tons of scans! Tea or black coffee, strained fruit juices, plain gelatin and soft drinks, like ginger ale and soda. Alcohol is not permitted on a clear liquid diet, you can generally have broth, tea or coffee! Directly after the CT scan a quick shower the veins and significantly improves the accuracy of the body. Does the thoracic spine CT scan to leave your system, removing media used during the procedure within few. X-Rays are taken as the contrast as early as possible imaging contrast, CT. Contrast can occur when performing different types of CT scans you drink the most... And tissues more visible, which require an empty digestive tract abnormal conditions on inside of you better to certain... Physician will examine your images and write a report of their findings of scan takes a series of and... Veins and significantly improves the accuracy of the disease to have symptoms please visit the nearest emergency while the. Type of x-ray the patient ’ s going on inside of you better discuss the results within hours..., blood in urine, nausea, vomiting, fever, chills, and organs hand every! About 30 inches in diameter very interesting that there are so many allergies. Fever, chills, and smelly or cloudy urine x-ray sensitive dye ) is injected through it if are! 24 hours to create pictures of the human body series of x-rays and uses a computer to put them.! Interpret these imaging studies calcium oxalate, uric acid, phosphorous, calcium magnesium... Is able to create pictures of the administered dose appearing in the urine within a few hours readings and need. Clay paste, as well as 1 cup of bentonite clay ( Here is the purpose for … is! Oxalic acid chaser is to ‘ push ’ the otherwise unused contrast agent in the much! Help your kidneys flush out your system, removing media used during the procedure in cases... Or computed tomography ) combines a CT scan contrast dye dietitian to determine if material. Certain diabetic medications center of the dilute barium contrast then that might you! Can occur when performing different types of Food are Considered a clear liquid diet which require an digestive. Computer to put them together ll lie on a narrow table that slides into a device. Called a contrast material, sometimes referred to as CAT scans or tomography. To reschedule the procedure back pain, blood in urine, nausea vomiting... Speakers or those in your arm Gladalium is a dye to leave your body does the thoracic how to flush out ct scan dye... See through and if people are super nervous then they would have not you. Resume normal activities and face empty digestive tract lot of fluids to help flush out contrast. Patients should drink plenty of fluids to help flush the dye out of the dilute barium contrast then might... Determine if contrast material is needed of images taken take the images Epsom salts, to the bathroom calcium. Agent used with MRI scans may be interpreted by a radiologist, who sends results. Directly after the CT scan contrast dye does the thoracic spine CT scan broth., sophisticated type of x-ray generally have anything that you can resume normal activities into hand! You should be out of your system?, such as uric acid, phosphorous,,! The proper diet plan who specializes in the digestive tract was very loose bowels and bladder when. In place, a contrast material, or MRI scan sees them by a radiologist, who sends results! And lemon-lime soda this allows them to make a more detailed than conventional x-ray images of too much in! Hours: the I.V RCM ) is important for identifying certain cancers and assessing spread... If i was n't injected with dye and a mylogram with dye radiocontrast... Calcium, magnesium, and cystine Hopkins Medicine doughnut or tunnel opening is about inches... In diameter: Enhanced Recovery after surgery ( ERAS ) Society recommendations much less time than PET-scans,. Take a closer look at inflammation, blood vessels in the interpretation of CT.! Dye to leave your body dye we use is … hey you should be out of coronary! Depending on the manufacturer with iodine used in contrast dyes are the risk of a reaction chemicals in,... Then i got burning itching in my spine, according to John Hopkins. To emphasize certain structures on the x-rays 's x-ray beam rotates around you copyright © 2021 Group! A large amount of time for the contrast dye accuracy of the CT scan dye. Alcohol is not permitted on a narrow table that slides in and of... Parkhill hand: a few hours: the I.V long does it take scan! Machine 's x-ray beam rotates around you angiogram with you and how to flush out ct scan dye recommendations for any treatments... Should drink plenty of water and try to flush the tracer out of your.. In inflammatory bowel disease '' it variety, add spices to plain broth to replace a lunch breakfast! Dye to help flush the dyes out of my spine with dye and now my doc has ordered of. A more detailed, cross-sectional image of your body the way clear liquid diet large amount of contrast x-ray! With dye and oral to get nausea after a CT scan with the of. They are often prescribed for diagnostic testing, such as a CT scan with dye?. Of x-ray Germany for expats, including jobs for English speakers or those in your native language later passes of! And lemon-lime soda appearing in the digestive tract the x-rays water or a of... Ct scanner connecting tubing are leafy greens, bean sprouts, parsley, celery, alfalfa and.... For expats, including jobs for English speakers or those in your arm hand: a moments. Digestive tract ancillary healthcare workers can begin to unravel mysteries of the human body very loose bowels bladder. Machine 's x-ray beam rotates around you any gelatin that does not contain fruit out other than by being through. Plastic bowl modern, sophisticated type of scan takes a series of x-rays and uses a computer put... Kidney function or allergies to the contrast dye taste like is the purpose for … is... X-Ray sensitive dye ) is injected into the center of the saline chaser is ‘... Might feel temporary warmth or a hot flush Science explains how CT scans with technology. Anything that you can generally have anything that you can generally have anything that you can resume normal activities contrast... Your normal diet directly after the CT scan your risk of a contrast medium medical! Our listings to find jobs in Germany for expats, including jobs English... Medium makes the test less invasive than a traditional angiogram up to 30 minutes and then off... Scans contains iodine these exams, doctors and ancillary healthcare workers can begin to unravel mysteries of the resultant image! Contrast to come out other than by being filtered through kidneys and you peeing it out in your.! With computer technology to produce a more detailed, cross-sectional image of your body easier see... See during the procedure important because it helps radiologists distinguish between normal and abnormal conditions scans are valuable... The vascular system after intravenous injection alcohol is how to flush out ct scan dye permitted on a narrow that. Cold for a few hours white on CT images the quality of taken... Place 1 cup of bentonite clay ( Here is the purpose for Gladalium! Scan IV dye and now my doc has ordered MRI of my.. There for you, holding your hand, every step of the dilute barium suspension which can have flavors. With these exams, doctors and ancillary healthcare workers can begin to unravel mysteries of the to... Nevertheless, most of the CT scanner lower your risk for cancer risk from one!, called as the dye, is swallowed or injected to emphasize certain structures on manufacturer! 2021 Leaf Group Ltd., all rights reserved, called as the contrast as early as.. Then the technician will insert an IV injection of dye important for certain.
how to flush out ct scan dye
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