Download or read book Attenuation Correction with Region Growing Method Used in the Positron Emission Mammography Imaging System Supported by Knowledge Innovation Project of The Chinese Academy of Sciences KJCX2 EW N06 written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The Positron Emission Mammography imaging system (PEMi) provides a novel nuclear diagnosis method dedicated for breast imaging. With a better resolution than whole body PET, PEMi can detect millimeter-sized breast tumors. To address the requirement of semi-quantitative analysis with a radiotracer concentration map of the breast, a new attenuation correction method based on a three-dimensional seeded region growing image segmentation (3DSRG-AC) method has been developed. The method gives a 3D connected region as the segmentation result instead of image slices. The continuity property of the segmentation result makes this new method free of activity variation of breast tissues. The threshold value chosen is the key process for the segmentation method. The first valley in the grey level histogram of the reconstruction image is set as the lower threshold, which works well in clinical application. Results show that attenuation correction for PEMi improves the image quality and the quantitative accuracy of radioactivity distribution determination. Attenuation correction also improves the probability of detecting small and early breast tumors.

Download or read book Screen Film Mammography written by Gary T. Barnes and published by Medical Physics Publishing Corporation. This book was released on 1991 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides guidelines for obtaining high-quality mammographic images while exposing patients to reasonable amounts of radiation. Appropriate physics measurements, responsibilities, and proper as well as time-efficient measurement techniques are discussed.

Download or read book CO2 Temperature and Humidity written by Dave Gold and published by Quick American Archives. This book was released on 1997-07-17 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Indoor and greenhouse gardeners can increas plant growth by up to 200% by adding CO2 to their gardens. Gold and Rosenthal explain exactly how to set up a system.