By Sydney Lou Bonnick MD, FACP, Lori Ann Lewis MRT, CDT (auth.)
With the swift proliferation of hugely delicate bone densitometry units considering 1995, the extent of ability required to function them and interpret their effects has risen sharply and now frequently exceeds the formal education of many operators. In Bone Densitometry for Technologists, prime densitometry specialists Sydney Lou Bonnick, MD, FACP, and Lori Ann Lewis, MRT, CDT, got down to right this deficiency by means of reviewing in uncomplicated language the necessities of densitometry and its daily perform. Written particularly for radiologic technologists, nurse practitioners, health care provider assistants, and devoted densitometry technologists, this booklet presents the entire sensible wisdom had to expertly function any of trendy subtle densitometry machines. issues variety from technical descriptions of all FDA-approved densitometry units to a scientific evaluate of osteoporosis, and comprise accomplished tutorials on laptop fundamentals, anatomy for densitometrists, the artwork of examining attempt effects, and appearing profitable precision studies-all crafted to satisfy the day-by-day wishes of the working towards densitometrist. extra chapters whole the technologist's skill-set with discussions of mechanical upkeep, radiation protection, and the terminology and conventions utilized in the occupation.
entire, informative, and hugely sensible, Bone Densitometry for Technologists emphasizes the position of densitometry and technologists within the prognosis and administration of osteoporosis. It offers a legitimate foundation for a whole knowing of the usually esoteric technical manuals provided by means of brands, and is going a long way past that realizing to allow specialist operation of any authorized densitometry equipment.
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Additional resources for Bone Densitometry for Technologists
The NHANES III Database for the Proximal Femur Although the development of the sBMD reduced the apparent discrepancies between the reported values for BMD at the PA spine and total femur among the three major DXA device manufacturers, discrepancies still remained between the percentage comparisons and standard scores. These discrepancies were seen at both the lumbar spine and the proximal femur, but the problem was clearly greatest at the proximal femur. In 1992 Pocock et al. (5) noted that the percentage comparisons for the spine were similar in 46 women studied on the Hologic QDR-1000 and the Lunar DPX.
Like the "% Age-Matched" comparison, the z-score only indicates how the patient compares with her age-matched peers. A poor z-score should prompt a thorough evaluation for causes of bone loss other than age and estrogen deficiency. Statistically, a poor z-score is anything below or poorer than -2, but certainly such an evaluation should be pursued at any time the physician deems necessary. Chapter 1 / Conventions in Densitometry 17 Because both peak bone density and the expected bone density for any age can be affected by the race and weight of an individual, the percentage comparisons and standard scores can be adjusted to take these factors into account.
There is nothing in the definition of the z-score that specifies the average to which the comparison is being made. Is it the average peak value of the young adult or the average value that is expected for the patient's age? In years past, this dilemma was addressed by labeling the comparisons "Young-Adult Z" and "AgeMatched Z" in order to make clear what comparison was being made. This is no longer done today. By convention in densitometry, it is understood that the z-score comparison is the comparison to the average value expected for the patient's age.
Bone Densitometry for Technologists by Sydney Lou Bonnick MD, FACP, Lori Ann Lewis MRT, CDT (auth.)