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Bone Densitometry for Technologists
Chapter 4 - Performing a DXA PA Lumbar Spine, Proximal Femur or Forearm DXA Study
13
Medical
Professional
06/28/2017

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Term
Rotation of the spine for any reason should be expected to cause an apparent ___________ in bone density when measured with DXA.
Definition
decrease
Term
Rotation is perhaps most easily signaled on the bone density study by the lack of alignment of the __________.
Definition
spinous process
Term
The femoral neck should ideally be ___________ to the plane of the exam table.
Definition
parallel
Term
The best visual indication of the rotation of the proximal femur is the size of the ___________ in the proximal femur scan image.
Definition
lesser trochanter
Term
Insufficient rotation results in a very large appearing ___________, called the ___________ sign.
Definition

lesser trochanter

 

"Pikes Peak"

Term
An imaginary line that bisects the femoral shaft that should be ___________ to the edge of the scan table, not the lateral edge of the femoral shaft itself.
Definition
parallel
Term
The ___________ is an important anatomic structure from the perspective of recognizing the degree to which the femur has been rotated during positioning for a proximal femoral bone density study.
Definition
lesser trochanter
Term
Internally rotating the proximal femur ___________ will generally bring the femoral neck parallel to the plane of the scan table.
Definition
15-20º
Term
The femoral neck BMD is the ___________ when the femoral neck is parallel to the scan table.
Definition
lowest
Term
Inadequate internal rotation and thus a failure to achieve parallel femoral neck positioning are indicated by a large ___________
Definition
lesser trochanter
Term

True or false?

 

There was no statistically significant difference between the average femoral neck BMDs in the right and left femurs.

Definition
True
Term
The dominant forearm bone densities tend to be ___________ than those of the nondominant side.
Definition
higher
Term
In healthy individuals, the BMC at the 33% radial site differs by ___________ between the dominant and nondominant arms.
Definition
6-9%
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