Principles of Radiation Physics Questions and Answers Already Passed

Principles of Radiation Physics Questions and Answers Already Passed Why is the concept of dose-area product (DAP) important in radiation physics? DAP measures the total radiation energy delivered to the patient, taking into account both the dose and the area irradiated, which helps in assessing the risk of exposure. How does the energy of an x-ray beam affect its penetration through tissue? Higher energy x-rays can penetrate denser tissues, while lower energy x-rays are absorbed more by tissues and are less effective for imaging. What is the effect of tube filtration on image quality and patient dose? Tube filtration reduces patient dose by eliminating low-energy x-rays, but it can slightly reduce image contrast due to the removal of softer, lower-energy rays. How does the photon energy of x-rays relate to their ability to produce biological effects? Higher-energy x-rays have a greater potential to ionize atoms and molecules in tissues, leading to more significant biological effects such as cellular damage or mutations. 2 What is the purpose of using a grid in radiology? A grid is used to reduce scatter radiation, improving image quality by allowing only the primary x-rays to reach the film or detector. What is the primary function of the x-ray tube in radiology? To convert electrical energy into x-rays by accelerating electrons and colliding them with a target. How does increasing the kVp (kilovolt peak) affect the x-ray beam? Increasing the kVp increases the energy and penetrability of the x-ray beam, resulting in more penetrating radiation. What is the significance of milliampere-seconds (mAs) in x-ray imaging? mAs controls the quantity of x-rays produced and affects the overall image brightness. How does radiation interact with matter during diagnostic imaging? Radiation interacts with matter by either being absorbed, scattered, or transmitted through tissues, depending on the energy of the radiation and the properties of the tissue. 3 What is the role of the anode in an x-ray tube? The anode serves as the target where accelerated electrons strike, producing x-rays. How does the half-life of a radioactive material affect its use in medical imaging? A shorter half-life means the material decays more quickly, reducing exposure time and risk while providing a higher dose rate for diagnostic imaging. What is the difference between characteristic radiation and Bremsstrahlung radiation? Characteristic radiation occurs when an electron from the x-ray tube strikes an inner-shell electron of an atom, while Bremsstrahlung radiation is produced when an electron is decelerated near the nucleus of an atom. What is the purpose of using a filter in the x-ray beam? A filter removes low-energy, non-penetrating x-rays from the beam, which reduces patient dose without affecting image quality.