MEDRADSC 3K03 Lecture Notes - Lecture 5: Divergent Series, Ampere, Voxel

• School: McMaster University
• Department: Medical Radiation Sciences
• Course: MEDRADSC 3K03
• Professor: Lyndsay Simmons

Document Summary

If calculating for helical: ma station x total scan time mas: milliampere seconds the product of tube current and exposure time. Matrix: two dimensional grid of pixels, used to compose images on a display monitor, the matrix determines the number of rows and columns. Larger matrix // greater number of pixels // higher spatial resolution. Voxel: three dimensional element of anatomy represented by the two dimensional pixel, 3rd element accounts for slice thickness, voxel volume = pixel height x pixel width x slice thickness. If dfov is smaller than it changes pixel size: pediatric values not listed, a(cid:374)(cid:455)thi(cid:374)g outside of fov , example ge. Largest sfov is limited by manufacturers specs: 70 cm gantry, 50 cm sfov. Question: you are scanning mr smiths abdomen and mistakenly choose a dfov of 25 keeping in mind that you selected the correct sfov.