Download PDF by Nicusor Iftimia, William R. Brugge, Daniel X. Hammer: Advances in Optical Imaging for Clinical Medicine (Wiley

By Nicusor Iftimia, William R. Brugge, Daniel X. Hammer

ISBN-10: 0470619090

ISBN-13: 9780470619094

This booklet presents scholars, academics, researchers and clinicians with a powerful and tested resource of knowledge on complicated optical applied sciences that express actual promise of being translated to medical use.

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X-ray films are taken with the dummy wires placed inside the applicators and the dummy dwell positions are digitized in treatment planning software. The dose prescribed at a certain distance from the applicator is achieved by varying source location, source activity, or dwell times [15,39]. In modern brachytherapy, US, CT, or MR images are used to visualize the tumor and to perform the treatment planning. For example, real-time US imaging is used for LDR permanent radioactive seed implant for prostate carcinoma.

The light emitted is detected by the photomultiplier tubes, located behind the crystal. Multiheaded gamma cameras can provide accelerated SPECT acquisition. A computer is used to apply a tomographic reconstruction algorithm (filtered backprojection) to the multiple projections, yielding a three-dimensional data set. This reconstructed image reflects the distribution and relative concentration of radioactive tracer elements present in the organs and tissues imaged. The pixel size ranges from 3 to 6 mm.

In modern multienergy machines, the electron beam that exits the horizontal waveguide is bent vertically down (90 or 270◦ ) in a magnetic field, then hits a scattering foil used to flatten the cross-sectional beam profile, which otherwise will have a Gaussian-like shape. This flattened beam is then collimated using special collimation systems and directed toward the patient for treatment delivery. The photon beams are created through a bremsstrahlung process: the electron beam created as described above hits a target made from a high-atomicnumber material.

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Advances in Optical Imaging for Clinical Medicine (Wiley Series in Biomedical Engineering and Multi-Disciplinary Integrated Systems) by Nicusor Iftimia, William R. Brugge, Daniel X. Hammer


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