Question

Which imaging modality is used to detect kidney stones?

• A. Tomography
• B. CT scan
• C. Ultrasound
• D. C.A.T. scan

Hint:

This scan builds detailed cross-section images using X-rays from many angles and is a highly accurate test for stones.

Answer 1

The Correct Option is B

Step 1: Recall how kidney stones are usually found.
Kidney stones are hard deposits that form inside the kidney from minerals and salts in urine. Doctors need an imaging test that can clearly show these stones and their exact size, number, and location.

Step 2: Identify the preferred imaging method.
A CT scan, short for Computed Tomography scan, uses X-rays taken from many angles and a computer to build detailed cross-section images of the kidney. It is considered a highly accurate imaging test for detecting kidney stones, since it can pick up even small stones that other methods might miss, and it also shows the exact location clearly for planning treatment.

Step 3: Check why the other options do not fit as well.
"Tomography" (option A) alone is a very broad term for any cross-sectional imaging method and is not specific enough to be the standard named test for kidney stones. Ultrasound (option C) is a useful, radiation free first test, often used as an initial screen, especially in pregnant patients, but it is generally less sensitive than a CT scan and can miss small stones or stones in certain positions. Option D, "C.A.T. scan," stands for Computerized Axial Tomography, which is simply the older full name for the same CT scan technology described in option B, so it names the same underlying test rather than a genuinely different one.

Step 4: Final Answer.
The CT scan is the imaging test used to detect kidney stones with high accuracy. \[ \boxed{\text{CT scan}} \]