CBET Diagnostic Imaging Equipment 5

Question 1

What is the function of the Bucky grid in radiographic imaging?

Accepted Answer

Move the grid during exposure to blur grid lines while absorbing scatter

Answer

The Bucky mechanism oscillates the grid during exposure so its lead strips do not appear as artifacts on the image while still absorbing scattered radiation.

Question 2

In nuclear medicine, the term 'half-life' as applied to a radiopharmaceutical refers to:

Accepted Answer

Time for radioactive decay to reduce activity to half its initial value

Answer

Physical half-life is the time required for half the radioactive atoms in a sample to undergo decay, reducing activity by 50%.

Question 3

A DICOM workstation cannot retrieve images from the PACS server. After confirming network connectivity, the BMET should verify:

Accepted Answer

AE Title, IP address, and port configuration for both nodes

Answer

DICOM communication requires matching Application Entity (AE) Titles, correct IP addresses, and open TCP ports between devices.

Question 4

Which MRI safety zone requires strict ferromagnetic screening of all personnel and equipment?

Accepted Answer

Zone IV

Answer

Zone IV is the MRI scanner room itself, where the static magnetic field is always present, requiring the strictest screening.

Question 5

On a mammography unit, the automatic exposure control (AEC) sensor is placed:

Accepted Answer

Behind the image receptor, in the beam exit path

Answer

The mammography AEC detector is positioned behind (distal to) the image receptor so it samples the transmitted beam to terminate exposure at the correct dose.

CBET - Certified Biomedical Equipment Technician Practice Test

CBET - Certified Biomedical Equipment Technician Practice Test

CBET Diagnostic Imaging Equipment 5