FREE ABR Diagnostic Medical Physics Questions and Answers
What is the primary mechanism of x-ray production in an x-ray tube?
Bremsstrahlung radiation occurs when high-energy electrons are decelerated upon interaction with the target material in the x-ray tube, producing a continuous spectrum of x-rays.
Which imaging modality uses Hounsfield units to represent tissue density?
Hounsfield units (HU) quantify tissue density in CT scans, where water is defined as 0 HU, air as -1000 HU, and dense materials like bone have positive HU values.
What does a modulation transfer function (MTF) measure in diagnostic imaging?
MTF evaluates the ability of an imaging system to accurately reproduce various spatial frequencies, reflecting its spatial resolution capabilities.
Which of the following is the most effective method to reduce patient dose during fluoroscopic procedures?
Increasing the distance between the x-ray source and the patient reduces the intensity of radiation reaching the patient, thereby lowering the dose.
What is the purpose of beam filtration in diagnostic radiography?
Beam filtration eliminates low-energy x-ray photons that contribute to patient dose without improving image quality, thereby reducing unnecessary exposure.