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Doctor insights on: Types Of Iodine Contrast Used In Ct Scans

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Dr. Shari Jackson
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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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Which type of CT scan required for detecting metastatic clear cell renal cancer in chest/abdomen, is it plain or contrast ?

Which type of CT scan required for detecting metastatic clear cell renal cancer in chest/abdomen, is it plain or contrast ?

This sounds like: Radiology calling. It should be the radiologist deciding, but the contrast tends to identify vessels, and some tumors "flush" with contrast. The contrast is iodine based. One wants to see vessels in venous phase in a kidney tumor, and looking for metastasis to liver and lung. I vote for contrast. ...Read more

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After CT scan what is duration of contrast medium (iodine) in body?

Are you sure.: If radio active iodine is used it is i-131 which has half life of less than 9days, then calculate every 9 days half of it will be eliminated in the body with i -131. Not bad if we did not synthesize i- 131 imagine if it is i- 129 which had half life of 15.7 million years. ...Read more

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Does the CT scan shows the radiation dose used in the scan in mSv?

Does the CT scan shows the radiation dose used in the scan in mSv?

10 mSv: A CT scan of the abdomen (belly) and pelvis exposes a person to about 10 mSv; this goes up to 20 mSv if the test is done twice (once with and once without contrast). ...Read more

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What are CT scans used for?

What are CT scans used for?

The potential: indications of CT are numerous. CT can be used to evaluate anatomy and diagnose abnormalities in almost any part of the body. CT can also be used as image guidance for a variety of diagnostic and therapeutic procedures. CT can also be used to monitor therapeutic responses for certain diseases. ...Read more

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Does an abdominal CT scan with and without contrast have the same amount of radiation as two CT scans?

Does an abdominal CT scan with and without contrast have the same amount of radiation as two CT scans?

Yes: The ct scan will consist of at least 3 parts. A very low dose scan to show the anatomy and allow for planning of the full ct scan. The next scan is the "real" scan without contrast. Then there will be at least 1 scan with contrast, usually when the veins are most opacified, at about 70 seconds after the start of the injection. However, some contrast scans have multiple phases for some anatomy. ...Read more

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Can chest CT scan puts me at the higher risk of thyroid cancer? Chest CT was done with contrast. Can contrast used in chest CT damage thyroid?

Can chest CT scan puts me at the higher risk of thyroid cancer? Chest CT was done with contrast. Can contrast used in chest CT damage thyroid?

Yes, no: There is some evidence that chest ct could put one at higher risk for thyroid cancer - but almost all of these suggest that it is dose dependent and that it would take repeated scans/exposure to elevate the risk. You can request protective covering for thyroid if need additional scans. The contrast used will not cause thyroid damage or disease. ...Read more

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What parts of the body are CT scans mostly used for?

What parts of the body are CT scans mostly used for?

There are CT: indications for almost every body part, but in general the most commonly scanned region is probably the abdomen. ...Read more

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What parts of the body are CT scans mostly used for?

There are CT: indications for almost every body part, but in general the most commonly scanned region is probably the abdomen. ...Read more

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Can a CT scan of the head without contrast dye detect brain aneurysms?

Can a CT scan of the head without contrast dye detect brain aneurysms?

Yes: While plain ct scan is not the best test for aneurysm, large aneurysms can potentially be spotted. Mri is a better test, especially when blood vessels are looked at as well. ...Read more

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What are the differences among CT scans, MRI scans and myelograms?

Myleogram: Ct myleogram is a better postop test then mrimyleogram invasive contrast in spinal canal MRI noninvasive. ...Read more

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Do ct scans with no contrast always miss tumors in the cerebellum?

Do ct scans with no contrast always miss tumors in the cerebellum?

Not always: Brain CT scans without contrast do not always miss cerebellar tumors. A tumor whose density is different from that of its adjacent brain tissue, or whose size is such that it pushes away adjacent brain tissue (distorting the normal shapes and outlines) will likely be visible even on noncontrast scans. ...Read more

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Is barium a better contrastvthen gastrografin for CT Scans. Had CT done in two diffrrent hospitals and one use Redicat (barium) and the other gastrogr?

About the same : Both of the contrast media show the bowel on CT . Sometimes the radiologist prefers one over the other. Gastrographin passes through the bowel faster than barium. Also cost of one over the other may be a factor ...Read more

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What type of CT scan is used for detecting appendicitis?

What type of CT scan is used for detecting appendicitis?

CT for appendicitis: CT scan of the abdomen and pelvis with oral and intravenous contrast. This is the standard for the imaging evaluation of appendicitis with excellent sensitivity and specificty. ...Read more

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Liver lesions can have different measrmnts in CT vs US, where CT is more acurate.Can measurements also be differece between CT and MRI?

Liver lesions can have different measrmnts in CT vs US, where CT is more acurate.Can measurements also be differece between CT and MRI?

Yes and no.: The lesion could still be the same size, but the reported measurements can differ because of slight differences in the manual placement of the measurement calipers, as well as potentially measuring the lesion in different planes. ...Read more

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R there various types /grades of MRI scan ? Ie, simple or enhanced one?

Dr. Calvin Ma Dr. Ma
1 doctor agreed:
R there various types /grades of MRI scan ?
Ie, simple or enhanced one?

Yes: Yes, there are many types of MRI brain scans that can be done, depending on the clinical indication. Mri brain without contrast, MRI brain without and with contrast, mr angiography of the head, mr venography, MRI brain perfusion, to name a few. Some exams will include additional or advanced imaging sequences beyond the standard depending on clinical indication of exam. ...Read more

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Is Full body PET scan or CT scan better for diagnosing Lymphoma? Which uses less radiation?

Is Full body PET scan or CT scan better for diagnosing Lymphoma? Which uses less radiation?

Both: The actual diagnosis of lymphoma requires tissue, usually excisional biopsy of an entire lymph node. Staging to see where other sites of disease could be is done with a combined PET/CT. The staging used to matter more many years ago when they would often give XRT or do surgery, it doesn't matter as much as it used to because almost everybody gets systemic chemotherapy for both Hodkins and non H ...Read more

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Any possible side effects of contrast used in MRI Pelvic Scan, though no side effects on most people?Any different types of contrasts for pelvic scan?

Any possible side effects of contrast used in MRI Pelvic Scan, though no side effects on most people?Any different types of contrasts for pelvic scan?

Not many: Gadolinium is usual mr contrast. Renal insufficiency or failure is contraindication. not many people are allergic to contrast. Certain internal metal objects made of iron and pacemakers will not allow scanning. Some patients are claustrophobic. ...Read more