ISCD EXAM (STUDY FOR THE ISCD CBDT EXAM IN
2025) QUESTIONS WITH 100% CORRECT SOLUTIONS.
Which type of bone makes up more of the skeleton's mass? (Cortical or
Trabcular) Answer - Cortical (80%)
Is Spine more Cortical or Trabecular? Answer - Trabecular
Is Hip more Cortical or Trabecular? Answer - Cortical
Is Wrist more Cortical or Trabecular? Answer - Trabecular
What is the site we use to assess trabecular bone Answer - Spine
What is the site we use to assess cortical bone Answer - Femoral Neck
Where is the source of the X Ray? Answer - Below the patient
Where is the detector? Answer - In the moving arm above the patient
Men under what age should use Z score Answer - 50
When do women use Z score Answer - when premenopausal
, What should % change be based off (t score, bmd, bmc, units?) Answer - BMD
in grams per cm²
What should be used to diagnose: t score based of.. which site? Answer -
whichever is lowest (1/3 radius, total hip, femoral neck, lumbar spine). This is
almost always femoral neck.
Should femoral neck be used to diagnose osteoporosis? Answer - no
Name 3 potential differences between devices Answer - 1. calibration
2. dual energy methods
3. edge detection software
What type of acquisition does Hologic use? (Wide or Narrow Fan Beam)
Answer - Wide Fan Beam (single smooth continuous image)
What type of aquisition does GE use? (Wide or narrow fan beam?) Answer -
Narrow Fan Beam (overlapping images)
Is TBS the same as FRAX? Answer - No, but TBS can be incorporated into FRAX
What does TBS detect Answer - More texture (more scattered/inconsistent
texture ei holes) means lower TBS
Does DXA use areal or volumetric BMD? Answer - Areal
Does QCT use areal or volumetric BMD? Answer - Volumetric
2025) QUESTIONS WITH 100% CORRECT SOLUTIONS.
Which type of bone makes up more of the skeleton's mass? (Cortical or
Trabcular) Answer - Cortical (80%)
Is Spine more Cortical or Trabecular? Answer - Trabecular
Is Hip more Cortical or Trabecular? Answer - Cortical
Is Wrist more Cortical or Trabecular? Answer - Trabecular
What is the site we use to assess trabecular bone Answer - Spine
What is the site we use to assess cortical bone Answer - Femoral Neck
Where is the source of the X Ray? Answer - Below the patient
Where is the detector? Answer - In the moving arm above the patient
Men under what age should use Z score Answer - 50
When do women use Z score Answer - when premenopausal
, What should % change be based off (t score, bmd, bmc, units?) Answer - BMD
in grams per cm²
What should be used to diagnose: t score based of.. which site? Answer -
whichever is lowest (1/3 radius, total hip, femoral neck, lumbar spine). This is
almost always femoral neck.
Should femoral neck be used to diagnose osteoporosis? Answer - no
Name 3 potential differences between devices Answer - 1. calibration
2. dual energy methods
3. edge detection software
What type of acquisition does Hologic use? (Wide or Narrow Fan Beam)
Answer - Wide Fan Beam (single smooth continuous image)
What type of aquisition does GE use? (Wide or narrow fan beam?) Answer -
Narrow Fan Beam (overlapping images)
Is TBS the same as FRAX? Answer - No, but TBS can be incorporated into FRAX
What does TBS detect Answer - More texture (more scattered/inconsistent
texture ei holes) means lower TBS
Does DXA use areal or volumetric BMD? Answer - Areal
Does QCT use areal or volumetric BMD? Answer - Volumetric
