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Doctor insights on: Iodinated Contrast

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Dr. Sewa Legha
64 doctors shared insights

Iodinated Contrast (Overview)

In order to show up on x-ray or ct, contrast needs to have a high atomic number and be physiologically available but not permanent! iodinated compounds satisfy these requirements, whether for intravascular or other uses. Substances like barium sulfate are ok for the gut, but not for injection into veins. In addition, kidneys clear iodinated substances from the body, showing the renal system.


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Can a CT scan without contrast dye detect brain tumours?

Can a CT scan without contrast dye detect brain tumours?

Should do it: If a brain tumor is causing significant symptoms, it should surely be large enough to be detected on a cat scan. ...Read more

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Dr. Sewa Legha
64 doctors shared insights

Iodinated Contrast (Overview)

In order to show up on x-ray or ct, contrast needs to have a high atomic number and be physiologically available but not permanent! iodinated compounds satisfy these requirements, whether for intravascular or other uses. Substances like barium sulfate are ok for the gut, but not for injection into veins. In addition, kidneys clear iodinated substances from the body, showing the renal system.


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Can CT scan without contrast show brain aneurysm?

Can CT scan without contrast show brain aneurysm?

Unlikely: Ct scan without contrast is unlikely to show an aneurysm unless it is very large and is calcified. A ct angiogram is a better study to visualize an aneurysm. ...Read more

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Is the contrast fluid radioactive?

Is the contrast fluid radioactive?

No: No, the contrast fluid used for hysterosalpingograms does not contain any radioactive materials. ...Read more

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Is barium safe with CT scan?

Is barium safe with CT scan?

Yes,: barium is safe with a CT scan. Dilute barium is often used as oral contrast for a CT. Non dilute barium(for example from a barium enema) will cause an artifact on CT which could obscure much of the anatomy and render the scan useless, so although it is not harmful to you, it could ruin the scan. ...Read more

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Nsclc st4. Diagnostic CT scans used iodine contrast but due to allergy, post treatment CT scans used barium. How accurate/comparable are the scans?

Not at all: Barium is an oral agent, and cannot be given intravenously. If you are allergic to iodine, you should be treated with a steroid prep prior to administration of iodine contrast. ...Read more

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What can an abdominal CT scan with IV dye and barium sulfate solution find?

Many things: In general areas of abnormal growth such as a tumor or fluid cyst, or areas of swelling such as inflammation or infection. The intravenous contrast solution and swallowed barium help the radiologist identify and separate nearby structures and organs, and help to better visualize possible abnormalities. ...Read more

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Can CT w/contrast reliably characterize small (<5mm) hepatic cysts?

Cyst fluid filled: Cysts are fluid filed, typically benign. Solid could be benign (not cancerous) or not. Small are typically benign. Ct may not be able to differentiate small solid abnormalities. Plan depend on other factors-may be monitor over time for stability. Cysts may not get followed. ...Read more

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Can an abdominal CT scan w/contrast show IBS?

Can an abdominal CT scan w/contrast show IBS?

Not really!: The CT will show spasm or edema ( swelling of the bowel wall) but you need something such as endoscopic studies to rule out any inflammatory disease which is a serious health issue, unlike that of irritable bowel which is also painful but not progress in most cases. ...Read more

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How are contrast ventriculography and radionuclide angiography different?

How are contrast ventriculography and radionuclide angiography different?

Ventrivculography: Both are different tests with different techniques. Contrast ventriculography is a cardiac catheterization procedures used to assess heart pumping function. Radionuclide angiography is a nujclear scan (muga scan) used to assess pumping function of the heart. Catheterization is an invasive procedure and muga scan is non-invasive procedure with minimal risk. ...Read more

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Allergic reaction to the contrast dye for cat scan?

Allergic reaction to the contrast dye for cat scan?

See below: Allergic reaction to ct scan contrast may range from mild skin rash and itching to severe skin rash and cardiac arrest. Patients at risk are those with previous adverse reactions to iodine-based contrast materials, history of asthma, history of allergy. Contrast reaction may be reduced or prevented if appropriately treated before the scan, but this is not 100%. ...Read more

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Is contrast mandatory for abdomen CT scan?

Is contrast mandatory for abdomen CT scan?

No: Iv contrast is often not used when the ct is for the purpose of looking for renal stones and in people with a history of contrast allergy or renal disease. It is often helpful in assessing persons with nonspecific abdominal symptoms as it will better show areas of inflammation, infection, and tumor. ...Read more

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Poor vision after IV infusion of contrast dye?

Poor vision after IV infusion of contrast dye?

Needs evaluation: Rarely contrast dye can knock loose some intravascular deposits which can lodge in narrow vessels and change the function of the part supplied. This has been reported rarely with the ophthalmic vascular supply. Have you ophthalmologist see this immediately to determine the cause. ...Read more

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Abdominal cat scan showed "homogeneous contrast enhancement", pancreas related, insulinoma?

Abdominal cat scan showed "homogeneous contrast enhancement", pancreas related, insulinoma?

Discuss with doctor: The description you gave is a little vague. The best thing to do is review the study with your doctor or with the radiologist that read the ct scan. ...Read more

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What is the difference between MRI contrast and CT scan contrast ?

What is the difference between MRI contrast and CT scan contrast ?

Not same: Mri contast gadolinium does not contain iodine while ct contrast contains iodine. An allergic reaction to ct contrast does not mean that you will have a reaction to gadolinium during your MRI scan. True allergies to the MRI contrast are exrtremely rare; however, you may still experience some symptoms like feeling lightheaded or nauseated due to the injection. Good luck with the exam! ...Read more

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Can abdominal CT with IV contrast show colorectal cancer ?

Can abdominal CT with IV contrast show colorectal cancer ?

Sometime: Unfortunately the exam you mention only discloses larger tumors. A "Vitrual colonoscopy" is a more sensitive test. It involves a preparation of the bowel . The "gold standard" is, of course a colonoscopy by a Gastroenterologist, you are too young to require this on a "routine basis" Do you have symptoms???? Hope this helps Dr Z ...Read more

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Will a contrast dye CT scan always show small gallstones in bile ducts?

Will a contrast dye CT scan always show small gallstones in bile ducts?

No: Contrast does not usually enter the bile ducts or gallbladder except under certain unusual circumstances. Gallstones and bile duct stones can often be seen in a non contrast ct scan, but they will also be detected in a carefully performed ultrasound exam. ...Read more

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Ct scan, mri, nuclear medicine imaging, ivp scan, how are they different?

Ct scan, mri, nuclear medicine imaging, ivp scan, how are they different?

Quite different: Ct involves xray type radiation with cross sectional imaging in transaxial, sagittal, and coronal projections. Nuclear medicine, internal irradiation either injected intravenously, inhaled, ingested, injected subcutaneously.Ivp uses injection of contrast material for visualization of kidneys and bladder with x-ray. Mr imaging uses no ionizing radiation magnetic fields to generate x-sectional images. ...Read more

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Do CT scans show appendicitis without using contrast fluid?

Do CT scans show appendicitis without using contrast fluid?

less accurate: While there is controversy about the liberal use of ct scans for the diagnosis of appendicits, it does increase accuracy of diagnosis. There are several parameters on ct scan that are used to diagnose or exclude appendicitis: visualization of the appendix, free fluid around the appendix, blurred fat or fat stranding around the base of the appendix and free air in the area of the appendix. ...Read more

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Can CT scan without contrast show any brain tumors?

Sometimes: Brain swelling, hemorrhage and mass effect can be noted on a head ct without contrast. Also, some tumors have calcification a which can be seen in a head ct. Smaller and lower grade tumors can sometimes be missed on a head ct without contrast. ...Read more

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What is the definition or description of: iodinated contrast?

What is the definition or description of: iodinated contrast?

Most x-ray contrast : In order to show up on x-ray or ct, contrast needs to have a high atomic number and be physiologically available but not permanent! iodinated compounds satisfy these requirements, whether for intravascular or other uses. Substances like barium sulfate are ok for the gut, but not for injection into veins. In addition, kidneys clear iodinated substances from the body, showing the renal system. ...Read more

See 1 more doctor answer
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What are the symptoms or allergic reaction or risks from using iodinated intravenous contrast during CT chest scan.

What are the symptoms or allergic reaction or  risks from using iodinated intravenous contrast during CT chest scan.

Adverse Reactions...: Adverse reactions to iodinated intravenous contrast agents range from a mild inconvenience, such as rash and itching associated with hives, to a rare anaphylactic reaction (life-threatening emergency). Renal toxicity is also a known adverse reaction associated with IV contrast mostly in patients with renal insufficiency. Prior allergic reactions to contrast, asthma, and allergies are factors assoc. ...Read more

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Why does iodinated intravenous contrast for a CT scan cause a warm feeling and metallic taste in the mouth?

Temp non harmful sid: there are two kinds basically contrast material high Osmolality and low Osmolality materials used. I would ask my radiologist this question. Usually it is a temp. Non harmful side effect. Good luck ...Read more

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Is the contrast fluid radioactive?

No: No, the contrast fluid used for hysterosalpingograms does not contain any radioactive materials. ...Read more

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Does contrast dye stay in your body?

Does contrast dye stay in your body?

No: Hydrate well after the IV contrast and it will be flushed out by the kidneys, . ...Read more

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How long does contrast dye last in your body?

Contrast: This really depends on where it is placed and used. Time will vary based on this. ...Read more

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Why we don't use contrast if there are stones?

Stones: Are radio-opaque and don't need extra contrast because they light up on their own. ...Read more

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How long does contrast dye stay in your system?

How long does contrast dye stay in your system?

Depends: The rate of clearance (or excretion) depends on the renal function of the patient. In patients with normal kidney function, 50% of the injected dose will be excreted at one hour, ~83% at three hours, and almost 100% at 24 hours. ...Read more

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Contrast medium helps distinguish between the solf tissues of what?

Contrast medium helps distinguish between the solf tissues of what?

Everything: Intravenous contrast helps show blood vessels, solid organs like the liver, and improves visualization of disease like tumors and infection. ...Read more

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After drinking 3 cups of contrast and an IV contrast can I eat right after?

After drinking 3 cups of contrast and an IV contrast can I eat right after?

Yes: As long as your test was OK. I know a lady who was diagnosed with a diverticular perforation, but still took off to eat after her scan. As long as you feel like eating there should be no problems. ...Read more

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I'm having a hidascan and wondering if it's an easy test with being injected with contrast ?

Plan. : If it first time in your life to be used contrast? If not , and you did not have reaction before , you will be OK. If it first nobody can predict your sensation to contrast, but it still should be ok. Because it's usually mild and easy can be resolved. Best wishes. You should be fine. ...Read more

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Is getting two different MRIs within 10 days bad for body due to contrast solution injection?

Is getting two different MRIs within 10 days bad for body due to contrast solution injection?

No, assuming: your kidneys are functioning normally, that shouldn't cause any problems. The contrast is eliminated from the body in the urine. ...Read more

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I have deeply contrasting , really light and really dark feaces , approx 50% of each in one deposit , is this anything to worry about ?

I have deeply contrasting , really light and really dark feaces , approx 50% of each in one deposit , is this anything to worry about ?

Probably not: Color of BM is almost always due to the type of food consumed. Meat meals, bismuth containing medications or consuming beets can make stools very dark, while those containing dairy or curry can be quite yellow. Consistently black tarry stools can be a sign of gastrointestinal bleeding. The 50/50 just means two foods of different types mixed in colon. Thanks for trusting HealthTap! ...Read more

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What can cause streaky vision? When objects move across my field of vision i see a trail of the object, especially in high contrast areas.

What can cause  streaky vision?   When objects move across my field of vision i see a trail of the object, especially in high contrast areas.

Vitreous floaters: What you describe may be a new object floating in the fluid in the back of your eye. It is important for you to get your eyes looked at to be sue you are not developing a retinal tear or detachment. ...Read more

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Horrible left ab pain for months. No tests show anything. Would a horrible reaction to MRE Contrasts help in diagnosis since its rare to react to it?

Horrible left ab pain for months. No tests show anything. Would a horrible reaction to MRE Contrasts help in diagnosis since its rare to react to it?

R/O IBS: IBS is a diagnosis of exclusion. IUC/CROHNS DZ/IBD is inflammation usually DX by BX IBS SX can be managed .You need a full exam and blood work. Especially screen for H pylori . Also stool screen x 3 for occult blood /parasite/ &colonoscopy./EGD While you are getting these items checked out you should stick to a gluten free diet . Ie gutbliss.com and Wholeapproach.com The SX wax and wane. ...Read more

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What is an MRI without contrast?

It is: a standard MRI examination performed without the injection of intravenous contrast material("dye"). Some types of MRI studies require contrast, others don't. ...Read more

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What is an X-ray contrast medium?

What is an X-ray contrast medium?

It is a substance: used in medical imaging to help identify and delineate pathology and anatomy. It is called contrast because it has physical properties that make it look dissimilar to the normal tissue appearance(for example, barium absorbs xrays and looks white). Thus, it can outline abnormalities. ...Read more

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Best thing to do after MRI with contrast?

Best thing to do after MRI with contrast?

Drink Fluids: Allergic reaction from gadolinium dye is extremely rare. However, if you experience symptoms such as rash, hives, or shortness of breath, you should notify the technologist immediately if you are still at the imaging facility, or call your doctor or go to the nearest hospital if you have already left the imaging facility. In addition drink plenty of fluids. ...Read more