By Gary Heller, April Mann, Robert Hendel
A targeted evaluation of the thoughts utilized in nuclear cardiology
This well-illustrated consultant bargains a accomplished examine the foundations and methods in the back of myocardial perfusion imaging, together with instrumentation and cameras, normal concerns, radiopharmaceuticals, and radiation defense and regulatory issues.
Whether you're a health care professional or technologist, a resident or fellow in education, or are getting ready for the Cardiology Board examination, Nuclear Cardiology: Technical functions is the best option to examine the real technical features of acting actual nuclear cardiology and cardiac CT studies.
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Unfortunately, it also greatly increases the number of random events detected (because the randoms rate increases as the square of the singles rate) and the amount of scatter that is detected. With a single ring, any photon that is scattered out of the plane of the detectors is lost, greatly reducing the fraction of scatter collected. With a multiring scanner, this is no longer the case. A compromise solution to this problem is to insert thin absorbing tungsten septa between the crystal planes (Figure 2-9).
1 mm. 1 mm (Figure 1-28). 12 The Jaszczak phantom should be acquired and processed according the ACR guidelines. The phantom is filled with water and 10 to 15 mCi Tc-99m (desired count rate = 10– 25 kcps). 45 for large FOV cameras, and a radius as close to 20 cm as mechanically possible. 8 mm. 5 mm. 1 Figure 1-28. Cross sections of the rods and spheres of the Deluxe Jaszczak total performance SPECT phantom. CHAPTER 1 r S P E C T I N S T R U M E N TAT I O N 23 Figure 1-29. A uniform Jaszczak image contrasts the ring artifacts created by ﬂood ﬁeld nonuniformities in SPECT reconstruction.
In 1972 this changed because Godfrey Hounsfield produced his first clinical X-ray CT image, reconstructing the image with filtered backprojection (FBP). In 1975, Ter-Pogossian et al. described a ring-based PET instrument that reconstructed images using FBP,4 ushering in the modern era of PET imaging technology. PET RADIOTRACERS PET images are based on the detection of a tracer that is typically injected into the body. By comparing the distribution of the tracer in a patient to normal templates, a physician is able to evaluate how well different organs and systems in the body are functioning.