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Doctor insights on: What Is In The Contrast Dye For A Ct Scan

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Is a CT scan without ivp dye as accurate as a CT scan with ivp dye of the abdomen? I have anaphylaxis to the dye.

Is a CT scan without ivp dye as accurate as a CT scan with ivp dye of the abdomen? I have anaphylaxis to the dye.

See answer: Contrast (dye) adds additional characterization of soft tissues, vascular structures, and the urinary collecting system. Ct with contrast (if your dr. Feels the risks of a prophylactic steroid prep and a hospital based exam outweigh the risks) is an option or more safely, consider MRI or possibly an ultrasound. ...Read more

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Dr. Alan Heldman
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Computed Tomography (Definition)

Ct uses xrays taken an 360 degrees combined with a computer to see"inside" the body. The table moves as the xray tube and detectors spin around the patient 10 times a second or more! the image shows excellent soft tissue detail, enhanced with injection of intravenous contrast or oral contrast. This way the body is shown in slices, in any plane, usually axially, but ...Read more


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When is contrast needed for a CT scan of neck?

When is contrast needed for a CT scan of neck?

Contrast: Needed to look for cancer or infection and to see extent of penetrating trauma. Cta uses dye yo look at vessels in more detail. ...Read more

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What is involved in having a contrast CT scan for my kidneys?

What is involved in having a contrast CT scan for my kidneys?

Iv contrast +/- oral: After taking the contrast, taking the images does not take long. The IV contrast has potential 2 problems. You may be allergic to it like any medicine and it may slow down the kidneys if they are not working near full capacity. Your doc can tell the risk based on blood tests of kidney function. ...Read more

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What is a pet CT scan used for?

What is a pet CT scan used for?

Several uses: In most cases PET CT scan is used for detecting metatases in the body. It can also be used for brain with mets, primary tumors, and epilepsy. Injection of glucose metabolite F18 FDG goes to malignant lesions that are highly metabolic,. Usually more sensitive for detecting smaller lesions. Used in staging malignancies and following patient's response to chemotherapy and radiation ...Read more

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What is the difference between a CT venogram and CT with contrast?

What to look for: CT venogram is a study for the veins of the body. Looking for something in the veins. Site of injection may be different timing different. CT with contrast has contrast material also. Timing also different ...Read more

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What is involved in getting a CT scan? Mri?

What is involved in getting a CT scan? Mri?

See your doc: First you have to see a doctor to be evaluated. If your symptoms suggest something that needs further work-up, then your doctor may order a ct or mri. Your insurance company may have to approve as well. ...Read more

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What is the difference between a pet scan and a CT scan?

What is the difference between a pet scan and a CT scan?

Metabolism / Anatomy: A pet scan is an image study that assess glucose metabolism for different tissues in your body using gamma photons while a ct scan is an anatomic picture of your body that reveals size, shape and intensities of organs using x-rays. Pet scans have several indications, including: cancer, cognitive disorders and heart perfusion stress and viability. ...Read more

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What is the difference between an MRI scan and a CT scan?

MRI vs CT: MRI creates images from manipulation of strong magnetic fields, CT uses ionizing radiation just like xrays. CT is much faster and allows for a large survey of parts of the body. MRI is more suitable for evaluating more specific tissues (heart, brain, joints) Each has their own advantages & disadvantages and largely depend on what is being assessed. Always confer with a radiologist! ...Read more

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What is the difference between an MRI scan and a CT scan?

What is the difference between an MRI scan and a CT scan?

MRI vs CT: MRI creates images from manipulation of strong magnetic fields, CT uses ionizing radiation just like xrays. CT is much faster and allows for a large survey of parts of the body. MRI is more suitable for evaluating more specific tissues (heart, brain, joints) Each has their own advantages & disadvantages and largely depend on what is being assessed. Always confer with a radiologist! ...Read more

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Is contrast fluid necessary in a CT scan looking for appendicitis? ?

Is contrast fluid necessary in a CT scan looking for appendicitis? ?

depends: Acute appendicitis can be diagnosed with good accuracy by history, physical exam, ultrasound, and non-contrast ct scan of abd/pelvis. Now is some cases, where exam, history and other imaging is not diagnostic and observation of the patient with a surgeon is not possible, more sophisticated imaging, contrasted ct can help. Be well. ...Read more

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Is a ct scan of the chest safe?

Is a ct scan of the chest safe?

Perspective : It depends on why you are getting it. Is the risk greater than the benefit? If so, then probably not a good idea to get it. If the potential benefit is greater than the risk of not getting it, then I'd say absolutely, get it done. However, just know, the radiation exposure to a CT is about the same as 200 chest X-rays. ...Read more

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What is the difference between a ct urography and an abdominal ct with contrast?

What is the difference between a ct urography and an abdominal ct with contrast?

Technique: Routine CT with contrast is usu. done with images taken with about a 90 sec delay after contrast is given IV. Images are viewed as cross sections and often sagittal (side views). Some places include coronal (frontal) too. CT urography also includes a set of 12-15 minute delayed images which are then reformatted in 3D. See picture. Both techniques often also employ non-contrast imaging as well. ...Read more

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Does a contrast CT scan to view my kidney include both IV and oral contrast? Is this an abdominal CT scan or just renal/urinary?

Does a contrast CT scan to view my kidney include both IV and oral contrast? Is this an abdominal CT scan or just renal/urinary?

Depends: It depends on what the doctor has ordered and is looking for. No contrast will be used typically if the doctor is looking for kidney stones. If they are looking and the tissue of the kidneys directly, IV contrast will be used. Generally oral contrast is not used when looking for kidney pathology. Your scan will also show the neighboring abdominal organs. ...Read more

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When is a CT scan of the neck used?

Good test: Can look at bones for fracture if you had trauma. Can do cta neck to look at blood vessels if you have carotid artery disease. Can look at tissues to see if there is a cancer or infection. These are a very few examples of the uses of ct. See radiologyinfo.Org. ...Read more

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Is it possible for a CT scan of the head *without* contrast to show an unruptured brain aneurysm?

Is it possible for a CT scan of the head *without* contrast to show an unruptured brain aneurysm?

It is: possible, but not probable. The aneurysm would have to be relatively large, and even then the noncontrast appearance may not be specific. ...Read more

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What does a CT scan of the brain without contrast show?

What does a CT scan of the brain without contrast show?

Some things: CT scan of brain without contrast shows basic anatomy of brain, gray white matter differentiation, ventricles, and physiologic calcifications.Ventricles enlarged/ hydrocephalus, mass effect with displacement of normal structures, some bleeding,abnormal calcifications in tumors or old subdural hematomas, fractures.CT with contrast adds enhancement of certain lesions not seen,hyper/hypo vascular. ...Read more

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How is a CT scan and an MRI different?

MRI vs CT: The main difference is that CT uses ionizing radiation and MRI uses radiowaves (non-ionizing radiation). It is the ionizing radiation that causes injury to the DNA and potential to develop a cancer down the road. In general, CT is good at looking a differences in radiation absorption (x-ray density). MRI is good at looking at subtle chemical differences (water and fat) in tissues. ...Read more

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Ct scan dects brain aneurysms? Is it possible for a CT scan without contrast to reveal an unruptured brain aneurysm? Is the test meant to find that sort of thing?

Ct scan dects brain aneurysms? Is it possible for a CT scan without contrast to reveal an unruptured brain aneurysm? Is the test meant to find that sort of thing?

NOT THE BEST WAY: Mri with contrast will pickup most large aneurysms over the blood vessels of the brain, and a cat angio or a magnetic resonance angio would be used to find smaller aneurysms. Standard cat not usually successful. ...Read more

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Dr. Michael Gabor
1,914 doctors shared insights

Ct Scan (Definition)

Computed tomography (ct scan) or computed axial tomography (cat scan), is a medical imaging procedure that utilizes computer-processed x-rays to produce tomographic images or 'slices' of specific ...Read more