Identify the diagnostic study shown.

Identify the diagnostic study shown.

• A. Lumbar spine, CT, sagittal plane, bone window
• B. Thoracic spine, MR, sagittal plane, T1-weighted sequence
• C. Lumbar spine, CT, axial plane, soft-tissue window
• D. Lumbar spine, MR, sagittal plane, T2-weighted sequence

Answer: (A)

The key idea is recognizing how the imaging modality and windowing affect what you see. A bone-window CT scan emphasizes bony detail with sharp cortical margins and very limited soft-tissue contrast. When you look at a sagittal view of the lumbar spine, crisp outlines of the vertebral bodies and their cortices, with little soft-tissue shading, point to a CT image optimized for bone anatomy. MRI images, whether T1- or T2-weighted, would show much more soft-tissue and marrow detail and would not present bone cortex with the same high-contrast, edge-rich appearance. An axial CT would show cross-sectional anatomy rather than a sagittal view, and a soft-tissue CT window would reduce bone contrast, making the cortex less distinct. So the image’s combination of a lumbar-spine sagittal view and the pronounced bone detail indicates a lumbar spine CT with bone window settings.

The key idea is recognizing how the imaging modality and windowing affect what you see. A bone-window CT scan emphasizes bony detail with sharp cortical margins and very limited soft-tissue contrast. When you look at a sagittal view of the lumbar spine, crisp outlines of the vertebral bodies and their cortices, with little soft-tissue shading, point to a CT image optimized for bone anatomy.

MRI images, whether T1- or T2-weighted, would show much more soft-tissue and marrow detail and would not present bone cortex with the same high-contrast, edge-rich appearance. An axial CT would show cross-sectional anatomy rather than a sagittal view, and a soft-tissue CT window would reduce bone contrast, making the cortex less distinct.

So the image’s combination of a lumbar-spine sagittal view and the pronounced bone detail indicates a lumbar spine CT with bone window settings.