Question

How is CT uniformity tested? The difference in numbers must not exceed _____ HU from the baseline values.

Option 1: 5
Option 2: 10
Option 3: 15
Option 4: 20

Answer 1

CT uniformity is tested by assessing measurements in a uniform phantom and comparing them to baseline HU values. The acceptable difference for these measurements typically must not exceed to
`5 HU`guarantee CT scan quality and accuracy.

Step-by-step explanation:

CT uniformity is tested to ensure that the computed tomography (CT) imaging system is producing consistent and accurate density measurements across the scanned volume. A standard measure of uniformity is the acceptable difference in Hounsfield Units (HU) from the baseline, which is used for calibration and comparison purposes. For CT uniformity, the difference in numbers from the baseline values must not exceed certain thresholds to attest to the quality of the imaging performance.

According to various recommendations and guidelines within the radiology field, this difference typically must not exceed
`5 HU` to ensure the accuracy and reliability of the CT scans. Uniformity testing involves assessing measurements at various points within a uniform phantom and comparing these to predetermined baseline values. Should the variation exceed the threshold, it could indicate a need for system adjustment, recalibration, or maintenance.