MEDRADSC 2BB3 Lecture Notes - Lecture 3: Spatial Frequency, Latent Image, Frequency Domain

• School: McMaster University
• Department: Medical Radiation Sciences
• Course: MEDRADSC 2BB3
• Professor: Charbonneau

Document Summary

#, exam are sent to the modality worklist for technologist selection. Mri etc. and the pacs workstations: digital to analog conversion (dac) stored numeric values-digital matrix) into pixel matrix of varying brightness intensities on display monitor. * a data set that varies continuously (ie. rf signal) * from any modality, trace the transformations that occur related to analog image production. * a method of converting a data set that varies continuously to that of a signal that varies in discrete intervals. Spatial frequency: a line pair/unit of distance represents a cycle, the higher the spatial resolution, the higher the spatial frequency, the greater the line pairs (per unit area, spatial resolution may be described as spatial frequency (line pairs/distance) Spatial resolution: ability to detect and display separate structures that are very close together, may be quantified in terms of line pairs/mm, eg. 10 lp/mm would exhibit a higher spatial resolution than 3 lp/mm or spatial frequency in frequency domain.