Reproducibility of volume-adjusted bone mineral density of spine and hip from dual X-ray absorptiometry.

Skeletal size has a confounding effect on areal bone mineral density (aBMD) related to differences in skeletal volume. Several methods have been proposed for calculating volumetric BMD (vBMD), but in vivo precision data are limited for the spine and have not been published for the hip. We prospectively performed duplicate dual X-ray absorptiometry measurements of the anteroposterior spine and hip (n = 121) in a diverse female population referred for initial clinical BMD testing.

Effect of obesity on red cell mass results.

Unlabelled: Measurement of red cell mass with isotope dilution remains an important diagnostic test in the evaluation of patients with suspected polycythemia vera (PCV). Results and reference ranges are typically expressed in units normalized for body weight (mL/kg). Obesity is common in polycythemic patients, and it is important to know how the various published normative ranges compare across a wide range of body weights.

Radioiodine treatment outcomes in thyroid glands previously irradiated for Graves' hyperthyroidism.

Unlabelled: Persistent or recurrent Graves' hyperthyroidism after an initial treatment dose of radioactive iodine (RAI) is not uncommon and usually necessitates additional administrations. The radiation sensitivity of the previously irradiated thyroid gland is unknown but is of importance in selecting the retreatment dose.

Methods: A retrospective analysis of patients receiving RAI for Graves' hyperthyroidism was undertaken.

Comparison of motion correction algorithms for cardiac SPECT.

Unlabelled: Patient motion remains a significant source of unsatisfactory cardiac SPECT examinations. The extent to which image recovery can be achieved with correction algorithms is unknown.

Methods: Nine subjects who had completed motion-free redistribution 201Tlcardiac SPECT subsequently underwent simultaneous dual-isotope (201Tl/99mTc) SPECT with a 99mTc cutaneous point source, while the imaging table was subjected to predefined nonreturning y-translation movements.

Technetium-99m-pertechnetate uptake by intrathyroidal parathyroid adenoma.

A 57-yr-old woman was referred for preoperative scintigraphic localization of a parathyroid adenoma. Double-phase 99mTc-sestamibi imaging was performed followed by a separate-day [99mTc]pertechnetate thyroid scan. There was marked accumulation of both tracers by a right lower pole ¿thyroid' nodule which, at surgery, proved to be an intrathyroidal parathyroid adenoma.