By Sydney Lou Bonnick
Bone densitometry (BD) is a rare medical device. It presents a secure, non-invasive window to the skeleton. via that window, a doctor can receive important medical info that reinforces prognosis and improves sufferer administration. extra, a lot has replaced within the final decade to make bone densitometry the specially interesting box of drugs it truly is this day, incorporating imaging, physics, quantitative research, facts, and computing device know-how -- all utilized within the analysis and administration of osteoporosis.
No textual content info the cutting-edge and price of densitometry larger than Bone Densitometry in medical perform: functions and Interpretation, 3rd Edition. Written via well known specialist Sydney Lou Bonnick, MD, this version improves remarkably on her very popular past volumes, with an important replace and enlargement of fabric. New chapters replicate densitometry’s transforming into purposes in addition to the evolving wishes of the densitometrist. New fabric on radiation safeguard and evaluate for secondary factors of bone fragility is integrated, and the textual content additionally contains fabric from the new ISCD place improvement meetings (PDC’s), either the 4th grownup and the 1st pediatric. in addition, a whole appendix dedicated to the PDCs has been extra, supplying ideas to many unanswered questions touching on bone densitometry applications.
Comprehensive and worthy, Bone Densitometry in medical perform: software and Interpretation, 3rd Edition deals all basic care physicians and experts the proper reference for working towards state of the art bone densitometry and taking care of sufferers with, or in danger for, osteoporosis.
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Additional info for Bone Densitometry in Clinical Practice: Application and Interpretation
Br J Radiol 34:683--692. 13. Mack PB, Brown WN, Trapp HD (1949) The quantitative evaluation of bone density. Am J Roentgenol Rad Ther 61:808-825. 14. Vose GP, Mack PB (1963) Roentgenologic assessment of femoral neck density as related to fracturing. Am J Roentgenol Rad Ther Nucl Med 89: 1296--1301. 15. Cummings SR, Black DM, Nevitt MC, et al. (1993) Bone density at various sites for prediction of hip fractures. Lancet 341 :72-75. 16. Mazess RB (1983) Noninvasive methods for quantitating trabecular bone.
3%, respectively. U sing only two measurements creates a margin of error that is too great to 14 Bone Densitometry in Clinical Medicine Fig. 1-7. DPA of the spine. Photo courtesy of Lunar Corp. be clinically useful in following changes in bone density over time. Although these ranges can be narrowed by performing multiple measurements within a given period of time, this increases the costs associated with the testing, which similarly serves to reduce its clinical utility in this regard. As a practical matter, all spine bone-density studies in which the photon beam passes in an AP or PA direction will be unable to separate the highly trabecular vertebral body from its more cortical posterior elements.
These units are considered first-generation DXA units, or pencil-beam scanners. The next generation ofDXA scanners are fan-array scanners. The difference between these two types of scanners is illustrated in Figs. 1-11 and 1-12. Pencil-beam scanners employ a collimated X-ray beam that moves in tandem in a rectilinear pattern with a single detector, or, in the case of the Norland unit, two sequential detectors. Fan-array scanners employ an array of detectors, which obviates the need for a rectilinear scan path.