With current technology, the resolution of the DXA scan allows detailed visualization of osseous structures. This visualization enables correct region-of-interest (ROI) placement for BMD measurements and confirms correct patient positioning. In addition, the image can display artifacts that may adversely affect the BMD measurement.

Region of interest (ROI) and image assessment. A, Posteroanterior dual-energy x-ray absorptiometric (DEXA) image of lumbar spine includes T12 and ribs, L5 and iliac bone, and straight and centered spine.

DEXA image shows correct ROI placement. Equipment allows operator to reduce ROI size and change angulation according to morphologic features of femoral neck or exclude area from analysis. T-score decreases with correct ROI placement (femoral neck T …

Results are in grams (ash-weight) of mineral per square centimeter. Area BMD (g/cm2) correlates better with bone strength than volumetric BMD (g/cm3) . The BMD of the log on a DXA scanner would read manyfold higher density reflecting its inherently greater strength. T-score below -2.5 is osteoporosis. The scan printouts are the report.

2024年10月1日 · The correct selection of the region of interest (ROI) in the spine, hip, and forearm is important to ensure that the evaluation of the bone health of an individual is correct. This chapter will demonstrate how to exclude abnormal vertebrae from the analysis and share cases, demonstrating the interpretation of the forearm bone density analysis.

Our objective was to evaluate optical densitometry as a method of measuring the periprosthetic bone density of the tibial platform in total knee replacement using serial dual-energy X-ray...

Placement of the regions of interest (ROI) on the femur DEXA scan: the trochanteric region (ROI (t)) and the shaft region (ROI (s)). [...] Background and purpose — It is believed that in...

The key DXA steps described by the novel method were (1) proper mouse positioning, (2) region of interest (ROI) sizing, and (3) ROI positioning. The precision of the new method was assessed by reliability tests and a 14-week longitudinal study.

Dual-Energy X-Ray Absorptiometry (DEXA) is currently routinely used for determining bone mineral density. However, it has its limitations. Nowadays, CT technology has advanced so rapidly that the Hounsfield units (HU) values can be used in opportunistic screening for osteoporosis in patients during routine CT abdomen for other causes.

2014年4月2日 · The interpreting physician should check the scan for proper patient positioning and region of interest (ROI) placement. The spine should be aligned with the long axis of the scanner. The scan should include the inferior portion of T12 and the superior portion of L5.