An improved method for rapid objective measurement of gamma camera resolution
| Autor: | Trish A. Hander, Jack L. Lancaster, William D. McDavid, David T. Kopp |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Physics
Photons Models Statistical Pixel business.industry Aperture Bar (music) Phantoms Imaging Technetium General Medicine Models Theoretical Standard deviation law.invention Optics Quality (physics) law Optical transfer function Scattering Radiation Gamma Cameras business Radiology Image resolution Algorithms Software Gamma camera |
| Zdroj: | Medical physics. 27(12) |
| ISSN: | 0094-2405 |
| Popis: | An improved method for an easy, rapid measurement of the intrinsic spatial resolution of a gamma camera is presented. A simplified model was previously developed based solely on mean and standard deviation measurements taken from a region of interest in bar pattern images. This led to an estimate of the modulation transfer function and the full width at half maximum (FWHM) of a line spread function (LSF). The improved method involved expanding the simplified model to incorporate input modulation, square wave input versus the assumed sinusoidal input, aperture (pixel) size, and scatter from the plastic in the bar pattern. The input square wave modulation was calculated to be unity for the typical bar patterns used for gamma camera quality control assessment. For the typical range of bar sizes available, in combination with the typical resolving capabilities of gamma cameras, the sinusoidal approximation of the bar pattern was found to be valid ( |
| Databáze: | OpenAIRE |
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