By Jack Lancaster, Bruce Hasegawa
Authored through a number one educator, this ebook teaches the basic arithmetic and physics ideas linked to clinical imaging platforms. Going past mere description of imaging modalities, this publication delves into the mechanisms of picture formation and photograph caliber universal to all imaging structures: distinction mechanisms, noise, and spatial and temporal answer, making it an enormous reference for clinical physicists and biomedical engineering scholars. this can be an largely revised re-creation of The Physics of scientific X-Ray Imaging by means of Bruce Hasegawa (Medical Physics Publishing, 1991), and contains a wide variety of modalities reminiscent of X-ray CT, MRI and SPECT.
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Additional info for Fundamental mathematics and physics of medical imaging
8). A photostimulable phosphor screen emits light when stimulated by a light of a different wavelength (hence photostimulable). When exposed to x-rays, about half of the energy in the x-ray beam is trapped in the photostimulable screen as a “latent image” that decays slowly over time. This energy is released by scanning a red laser beam across the plate, generating blue light (the luminescence). The brightness of the luminescence is proportional to the intensity of the x-rays originally striking the screen.
3 MULTIPLANAR IMAGING: COMPUTED TOMOGRAPHY The older terminology for computed axial tomography (CAT) was shortened to CT. Any approach that computes tomographic section images (tomo means cut) can be classified as CT. CT therefore includes several modern radiological imaging methods: x-ray CT, SPECT, PET, magnetic resonance imaging (MRI), and even some forms of ultrasound imaging. As implied by their computing nature, all CT images are digital. The basic math describing formulation of a 2D section image from projections taken about an object has been known since the early 1900s.
Direct-conversion detectors both absorb x-ray energy and convert it to an electrical signal that is stored in a capacitor. Row–column readout electronics for the digital panels encodes locations of each detector and converts stored electrical signals into digital signals. The efficiency of x-ray absorption is generally higher for indirect-conversion detectors since its CsI:Tl scintillators have a higher average atomic number than the detection component in direct-conversion detectors (amorphous selenium [a-Se]).