Computed Tomography Test Computed Tomography Knowledge Questions and An 2

Question 1

Which windowing preset is most appropriate for evaluating pulmonary nodules on CT?

Accepted Answer

Lung window (W:1500, L:-600)

Answer

Lung window settings (wide width, negative level) optimize contrast for air-filled lung parenchyma and nodule detection.

Question 2

What is the primary advantage of dual-energy CT (DECT) over single-energy CT?

Accepted Answer

Ability to characterize tissue composition based on material decomposition

Answer

DECT acquires data at two energy levels, enabling material decomposition to distinguish substances like iodine, uric acid, and calcium.

Question 3

A CT scan shows an adrenal lesion with an unenhanced attenuation of 8 HU. What is the most likely diagnosis?

Accepted Answer

Adrenal adenoma

Answer

Adrenal lesions with unenhanced HU ≤10 are consistent with lipid-rich adenomas due to intracellular fat content.

Question 4

What does the term 'partial volume averaging' refer to in CT imaging?

Accepted Answer

Blending of attenuation values from different tissues within a single voxel

Answer

Partial volume averaging occurs when a voxel contains more than one tissue type, resulting in an averaged attenuation value that misrepresents both tissues.

Question 5

Which reconstruction algorithm produces sharper edges but increased image noise in CT?

Accepted Answer

Bone/sharp kernel

Answer

Sharp (bone) kernels apply high-frequency enhancement to improve edge definition, which amplifies noise compared to smooth kernels.

Computed Tomography Test Practice Test

Computed Tomography Test Practice Test

Computed Tomography Test Computed Tomography Knowledge Questions and An 2