MEDRADSC 2F03 Lecture Notes - Lecture 9: Digital Radiography, Attenuation Coefficient, Mammography

• School: McMaster University
• Department: Medical Radiation Sciences
• Course: MEDRADSC 2F03
• Professor: Lumsden

Document Summary

Intrinsic efficiency of a detector of ct cassette: its ability to detect photons: determined by the atomic number, photon energy (kvp), and detector thickness. Digital radiography has: excellent ability to capture a wide range of remnant beam signal magnitudes, excellent ability to customize processing and display. Probability of catching the radiation is dependent on the thickness of the capturing layer. Detective quantum efficiency (dqe): ability of ir to detect is the absorption coefficient, better with a higher kvp. Digital radiography has good spatial resolution for most body parts: better for mammography, post-processing, sharing of the image, wider ranges of signal (greyscale) Beam intensity: quantity of energy flowing through an area per unit time (roentgens), depends on both number of photons and energy of photons. Energy fluence: total quantity of energy flowing through an area, change the kvp to affect. Photon fluence: total number of photons flowing through an area. Change the mas or kvp to affect.