By William D. Leslie, I. David Greenberg
Univ. of Manitoba, Winnipeg, Canada. handbook contains radiation results and safeguard, myocardial perfusion imaging, bone density, inflammatory issues, tumor imaging, pediatric nuclear medication, and extra. Wire-spiral binding.
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19 Radiation Effects and Safety Table 2. 01 x rem rem = 100 x Sv * Quality Factor = 1 for all X-, gamma, and beta radiations; 5 for neutrons; 20 for alpha radiation. measurement. Effective dose from common radiologic and nuclear medicine procedures are summarized in Appendix 2. Background Radiation Living on Earth has always meant continuous exposure to natural background radiation including cosmic radiation, radiation from naturally-occurring minerals in natural surroundings and construction materials as well as internal radiation from radionuclides within our own bodies.
The sensitivity of detecting CAD is reduced in patients unable to attain 70% of their predicted maximum heart rate. In those able to exceed 70% but unable to reach 85% of predicted maximum, it appears that the detection of individual coronary stenoses is decreased while sensitivity (on a per patient basis) is maintained. If patients cannot perform adequate exercise, pharmacologic vasodilatation with dipyridamole or adenosine should be employed. In patients with significant reactive airway disease dobutamine is an alternative with similar sensitivity to exercise.
Ant-anterior; ap-apex; inf-inferior; lat-lateral; sep-septal) data spanning the R-R interval. This allows for assessment of wall motion and using commercially available software the determination of the left venticular ejection fraction (Fig. 8). Gated SPECT has become the standard technique for MPI. Interpretation and Quantification The interpretative approach to myocardial perfusion imaging is illustrated in Figure 9. A defect at stress which improves or normalizes at rest is termed a reversible defect and indicates ischemia.