CBET Diagnostic Imaging Equipment 2

Question 1

What does 'kVp' control in an X-ray generator?

Accepted Answer

Penetrating power (energy) of the X-ray beam

Answer

Peak kilovoltage (kVp) sets the maximum energy of X-ray photons, determining how well the beam penetrates dense tissues like bone.

Question 2

Which imaging modality uses radiofrequency pulses and a strong magnetic field rather than ionizing radiation?

Accepted Answer

MRI (Magnetic Resonance Imaging)

Answer

MRI aligns hydrogen protons with a strong magnetic field then uses RF pulses to disturb and detect their relaxation, producing images without ionizing radiation.

Question 3

A portable X-ray unit's collimator is found to be misaligned during PM. Why is this clinically significant?

Accepted Answer

Misalignment exposes patients to unnecessary radiation outside the intended field

Answer

Collimator misalignment means the radiation field does not match the light field, potentially exposing unintended anatomy and violating ALARA principles.

Question 4

In a PACS (Picture Archiving and Communication System), what standard protocol is used to transfer images?

Accepted Answer

DICOM (Digital Imaging and Communications in Medicine)

Answer

DICOM is the universal standard for storing, transmitting, and displaying medical images across modalities and systems.

Question 5

What is the purpose of a daily QC phantom scan performed on a CT scanner?

Accepted Answer

To verify image quality metrics such as noise, uniformity, and CT number accuracy

Answer

Phantom QC scans detect day-to-day drifts in CT number (HU) accuracy, image noise, and uniformity before patients are scanned.

CBET - Certified Biomedical Equipment Technician Practice Test

CBET - Certified Biomedical Equipment Technician Practice Test

CBET Diagnostic Imaging Equipment 2