ARRT Bone Densitometry study plan
ARRT Bone Densitometry · Give each week a clear focus.
8 weeks · About 7 hours per week
Equipment and Instrumentation
Diagram the X-ray tube, K-edge filter, detector arm, and positioning lasers of a DXA system and label the function of each component from memory
Explain how two photon energies separate soft-tissue attenuation from bone mineral attenuation
Compare pencil-beam, fan-beam, and narrow fan-beam geometries on scan time, dose, and image quality
Define BMD, BMC, and bone area and state the units and typical magnitude of each
Your checkpoint
Hand-drawn labeled schematic of a DXA gantry and detector path, plus a 15-item self-quiz scored at 80% or better
Equipment and Instrumentation
Sequence the daily, weekly, and monthly calibration steps on a DXA unit and state the acceptance tolerance for each
Classify hardware and software artifacts - detector drift, table flex, patient motion, implanted metal - and match each to a corrective action
Match each scan mode (PA spine, hip, forearm, whole body, lateral vertebral assessment) to its indications and contraindications
Describe how software version changes and reference database updates affect serial comparison of prior scans
Your checkpoint
Troubleshooting matrix of 10 artifacts versus causes and fixes, plus a recorded verbal walkthrough of a phantom calibration self-scored against a 10-point checklist
Image Acquisition and Analysis
Position a simulated patient for PA spine, proximal femur, and 33% radius acquisitions, naming the landmarks and rotation criteria for each
Place analysis ROIs for L1–L4, femoral neck, total hip, and radius using standard labeling conventions
Identify and correct positioning errors that invalidate a scan: excluded vertebrae, excessive femur rotation, soft tissue inside the hip ROI
State the precision requirements used to establish a least significant change from phantom and in-vivo measurements
Your checkpoint
One-page positioning and ROI checklist for all three sites written from memory, plus five mock scans scored pass/fail with a stated reason for each
Image Acquisition and Analysis
Calculate T-scores and Z-scores from a BMD value and population mean and SD, then classify the result against established diagnostic thresholds
Apply site-selection and reporting rules: which sites to report, when a Z-score is preferred over a T-score, and when repeat testing is justified
Compute least significant change and decide whether an observed serial change exceeds it
Detect analysis errors: mislabeled vertebrae, wrong reference database, ROI inconsistency between visits
Your checkpoint
Completed 10-case interpretation worksheet giving T-score, Z-score, diagnostic category, and repeat-scan recommendation, scored at 80% or better
Patient Care and Education
Explain the DXA procedure in plain language, covering duration, clothing, breath-hold instructions, and what the numbers mean
Screen patients for pregnancy, recent barium or iodinated contrast, recent nuclear medicine studies, and metal implants, and state the required wait interval or action for each
Describe infection control, fall and transfer precautions, and table weight limits for the scanner
Compare the radiation dose from a DXA scan with natural background and with other common imaging studies, and answer typical patient concerns
Document history, medications, and prior fragility fractures that change interpretation
Your checkpoint
Scripted 5-minute patient education talk plus a 12-item pre-scan screening checklist with the correct action for each positive finding
Patient Care and Education & Quality Control and Data Management
Perform and record a phantom scan, plot the result on a control chart, and compare it with the stated tolerance
Construct a control chart with a mean line and ±2 SD limits and distinguish a gradual trend from a single outlier
Execute the corrective action sequence when a QC point falls outside limits: repeat the scan, recalibrate, escalate to service
Explain retention, storage, transmission, and backup of DXA images and result data across local archive, PACS, and exported reports
Your checkpoint
Hand-plotted control chart of 20 simulated phantom values with out-of-limit points flagged and a written corrective action for each flag
Quality Control and Data Management
Assemble an annual QC calendar mapping each test to its frequency, tolerance, and responsible person
Apply privacy rules to scheduling, report distribution, and secondary use of scan data
Summarize regulatory obligations: equipment registration, operator credentialing, and state or facility licensure requirements
Trace a report from scanner output to referring physician and name three failure points that threaten data integrity
Your checkpoint
One-page QC calendar table (test, frequency, tolerance, action if failed) plus a data-flow diagram annotated with three failure points and mitigations
Equipment and Instrumentation & Patient Care and Education & Image Acquisition and Analysis & Quality Control and Data Management
Re-attempt every item missed in weeks 1–7 and write the underlying concept behind each miss
Complete two full-length timed practice exams under test-day conditions
Recite key numbers on demand: diagnostic thresholds, precision and least-significant-change formulas, QC tolerances, dose comparisons
Simulate a complete encounter from patient intake through final report in under 15 minutes
Your checkpoint
Scorecard from two full-length practice exams with both scores at 80% or higher, plus a one-page numbers sheet reproduced from memory
Milestones
Week 2: Score 80% or better on the artifacts-versus-causes matrix self-test and correctly order the full calibration sequence with tolerances on a blank sheet
Week 4: Score 75% or better on a timed 50-question exam covering domains 1 and 3, with every missed item logged by sub-topic
Week 6: Produce a control chart from 20 phantom values, correctly flag every out-of-limit point, and state the correct next action for each without notes
Week 8: Score 80% or better on two full-length timed practice exams and complete the intake-to-report simulation in under 15 minutes