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Doctor insights on: Abdominal Ct Without Contrast

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Dr. William Singer
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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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Can an abdominal CT scan with and without contrast detect micronodular adrenal adenomas? What's the false negative possibilities?

Can an abdominal CT scan with and without contrast detect micronodular adrenal adenomas? What's the false negative possibilities?

Adrenal adenomas: With most gland problems, first figure out if the hormones are elevated. If so, THEN go looking for the tumor. This is because all glands form nodules, but these nodules often have no consequence. If you have a hormone elevation (Cushings, pheo, aldosteronoma) and the source is the adrenal, the CT will almost always find it. But this is complicated. See your Endocrinologist. ...Read more

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Is an abdominal ct scan with & without contrast considered multiple scans or just one. Meaning is it more radiation, and how many scans are performed?

Is an abdominal ct scan with & without contrast considered multiple scans or just one. Meaning is it more radiation, and how many scans are performed?

One scan: That is one scan. No worries about excess radiation exposure unless a patient needs serial scans, such as to monitor the abdomen every few months for many years after cancer treatment. In real life, having a few CT scans makes no difference compared to the total radiation one receives merely by living on planet Earth. ...Read more

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On thursday, I had a pelvic ultrasound that showed two gestational sacs measuring about 4 weeks. I took a beta hCG on friday, it was negative, showing less than 1. I had an abdominal CT with and without contrast 2 weeks ago and sacs were not visible at th

Repeat ultrasound: I don't know why you have been having these radiologic tests; perhaps for pelvic pain? In any case, speak with your hcp and have a repeat ultrasound after 1-2 weeks. Repeat the HCG test too. If you were 4 wks pregnant on thursday's ultrasound, the ct scan would have been done near ovulation. ...Read more

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Can you comment on the reliability and accuracy of an abdominal/pelvic CT without contrast vs one with when it comes to identifying malignancy etc.

Can you comment on the reliability and accuracy of an abdominal/pelvic CT without contrast vs one with when it comes to identifying malignancy etc.

It depends: Most types of malignancy in the abdomen/pelvis are much better demonstrated with IV contrast, especially those affecting the solid organs (liver, pancreas, kidneys). While some types of cancer like lymphoma can be identified without contrast, many malignancies can be virtually invisible without the contrast. In general, oral and IV contrast is recommended for most abdominal/pelvic ct. ...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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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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Abdominal CT scan with oral contrast. What will this show?

Abdominal CT scan with oral contrast. What will this show?

Several things: Can be seen on ct scan. The oral contrast helps deliniate some of the intestinal findings. Other organs are also seen such as liver, pancreas, gallbladder, aorta, lymph nodes, kidneys, urinary bladder, uterus or prostate, vertebral column, etc. Some structures are seen better than others. ...Read more

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Please tell me if an abdominal CT with contrast the same as a virtual colonoscopy?

Please tell me if an abdominal CT with contrast the same as a virtual colonoscopy?

The same region: Is scanned, but the technical parameters are different, so they are not the same examinations. ...Read more

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