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All Blogs related to the ARRT Bone Densitometry Exam

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ARRT Bone Densitometry - Blogs Sample Questions

What type of DEXA device has "arm" suspended overhead?

Correct Answer:
central scanning device.
the correct answer to the question of what type of dexa device has an "arm" suspended overhead is the central scanning device.

dexa, which stands for dual-energy x-ray absorptiometry, is a technique used primarily to evaluate bone mineral density, an important factor in diagnosing osteoporosis. there are two main types of dexa devices: central dexa devices and peripheral dexa devices. each type is designed for specific scanning purposes and has distinctive features.

central dexa devices are typically used to measure bone density in the hip and spine. these are areas most prone to fractures due to osteoporosis. the central dexa device includes a large flat table where the patient lies down during the scanning process. above the patient, there is an "arm" suspended overhead. this arm is an integral part of the device; it houses the x-ray generator and detector. as the arm moves across the body, it sends low-dose x-rays through the bones being examined. the amount of x-rays that pass through the tissue and are captured by the detector on the opposite side is used to calculate bone density. the presence of the overhead arm allows for comprehensive scanning of the central skeletal structure, which is crucial for accurate assessment of bone health.

on the other hand, peripheral dexa devices are smaller, portable units used to measure bone density in peripheral parts of the body, such as the wrist, heel, or finger. these devices are often used in clinical settings or for screenings where a full central scan is not necessary. they do not feature an overhead arm as they are designed for smaller, more accessible areas of the body.

in summary, the type of dexa device that features an arm suspended overhead is the central dexa device. this setup is essential for providing precise and detailed scans of the body's central regions, which are critical for assessing bone health and diagnosing conditions like osteoporosis.

Which of the following best describes the rationale for the technologist avoiding the adjustment of the bone edges during a dual energy x-ray absorptiometry scan?

Correct Answer:
reproduction may not be possible at follow up


the primary concern in avoiding the adjustment of bone edges and intervertebral markers during a dual energy x-ray absorptiometry (dxa) scan focuses on ensuring consistency and reproducibility in follow-up assessments. dxa scans are critical diagnostic tools used to measure bone mineral density, which assists in evaluating the risk of fractures and diagnosing conditions like osteoporosis. accurate and consistent positioning of patients during these scans is crucial for reliable results.

during a pa (posteroanterior) spine dxa scan, the technologist is responsible for correctly positioning the patient to capture the best possible image of the spine. this involves aligning the bone edges and positioning intervertebral markers accurately. once these elements are set, any subsequent adjustments can lead to variations in the scan images, which can compromise the ability to accurately compare current results with previous or future scans.

consistent positioning ensures that changes in bone density are measured accurately over time, reflecting true physiological changes rather than differences due to positioning variances. therefore, unless absolutely necessary, adjustments to the bone edges or intervertebral markers should be avoided to maintain the integrity of longitudinal data. this approach helps in tracking the progression of bone density accurately, which is vital for managing patients’ treatment plans effectively.

if there are instances where adjustments are necessary, such as to improve the clarity of the image or to accommodate patient discomfort, these changes must be thoroughly documented. documentation should include details of the adjustments made and the reasons behind them. this information is crucial for interpreting changes in subsequent scans, as it provides context to any variations that might not be attributed to changes in the patient’s bone density.

in summary, the rationale for avoiding adjustments during a dxa scan is centered on ensuring that follow-up scans can be accurately reproduced and compared, thereby providing reliable and consistent data for assessing bone health over time.

Additional Blogs for ARRT - American Registry of Radiologic Technologists dfgdfgdfg

In your journey to get ARRT Bone Densitometry certified it is important for you to have all information related to your exam. So we have pulled together a list of additional blogs that may be of interest to you because that are all related to the American Registry of Radiologic Technologists.

Exam Edge Blogs for ARRT - American Registry of Radiologic Technologists