Radiology Physics Quiz Questions and Answers Rated A+

Radiology Physics Quiz Questions and Answers Rated A+ What gives an atom its identity as a specific element? The number of protons. What is the main reason X-ray tubes operate in a vacuum? To prevent electrons from colliding with air molecules. Why is tungsten used as the target material in X-ray tubes? Its high melting point and ability to produce X-rays efficiently. What happens to X-ray photon energy as its wavelength decreases? The energy increases. What is the primary reason for using collimators in radiography? To shape and limit the X-ray beam to reduce patient exposure. 2 What interaction is responsible for producing high-energy X-rays in the X-ray tube? Bremsstrahlung radiation. Why is a rotating anode used in high-output X-ray tubes? To spread heat over a larger area, preventing damage. What property of X-rays allows them to penetrate tissues? Their short wavelength and high energy. Why is filtration added to the X-ray beam? To remove low-energy photons that increase patient dose without contributing to the image. What type of scatter radiation is most common in diagnostic imaging? Compton scattering. What interaction is responsible for producing contrast in bone and soft tissue imaging? The photoelectric effect. 3 What does the term "attenuation" mean in radiology? The reduction in the intensity of the X-ray beam as it passes through matter. Why does increasing the kVp make the X-ray beam more penetrating? It increases the energy of the X-ray photons. What is the purpose of grids in radiology? To reduce scatter radiation reaching the image receptor and improve image contrast. Why is lead used in X-ray shielding? Its high atomic number and density make it effective at absorbing X-rays. What is the term for the smallest unit of a digital image? Pixel. How does smaller focal spot size affect image quality? It improves image sharpness. 4 What is the role of a scintillator in a digital imaging system? To convert X-rays into visible light for detection. Why is the inverse square law important in radiology? It explains how radiation intensity decreases as distance from the source increases. What is the significance of the half-value layer in radiology? It measures the thickness of material needed to reduce the X-ray beam's intensity by half. What is the primary function of automatic exposure control (AEC)? To ensure consistent image quality by controlling the exposure time. Why is it essential to keep radiation exposure as low as reasonably achievable (ALARA)? To minimize the risk of harm to patients and