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Urinary Calculi on Computed Radiography

Comparison of Observer Performance with Hard-Copy Versus Soft-Copy Images on Different Viewer Systems

¹ All authors: Department of Diagnostic Radiology, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Poongnap Dong Songpa Ku, Seoul 138-736, Korea.

View larger version (116K): [in a new window]   Fig. 1A. —28-year-old man with left-sided flank pain. Hard-copy (A) and soft-copy (B) radiographs of abdomen show round radiopaque density suggesting stone in left mid ureter (open arrow). Note clearer depiction of left ureteral stone (open arrow, B) and anatomic structure such as calcified lymph node (arrowhead) and sclerotic change of 12th rib (arrow) on soft-copy image (B). Diagnostic confidence for ureteral stone was 3.2 (mean value) on hard-copy and 4.7 on soft-copy images.

View larger version (118K): [in a new window]   Fig. 1B. —28-year-old man with left-sided flank pain. Hard-copy (A) and soft-copy (B) radiographs of abdomen show round radiopaque density suggesting stone in left mid ureter (open arrow). Note clearer depiction of left ureteral stone (open arrow, B) and anatomic structure such as calcified lymph node (arrowhead) and sclerotic change of 12th rib (arrow) on soft-copy image (B). Diagnostic confidence for ureteral stone was 3.2 (mean value) on hard-copy and 4.7 on soft-copy images.

View larger version (116K): [in a new window]   Fig. 1C. —28-year-old man with left-sided flank pain. Delayed excretory urography image reveals stone (arrow) obstructing left mid ureter.

View larger version (134K): [in a new window]   Fig. 2A. —53-year-old man with left-sided flank pain. Hard-copy (A) and soft-copy (B) radiographs of abdomen show tiny radiopaque density suggesting stone in left ureterovesical junction (open arrow). Note clearer visualization of urinary stone (open arrow) and anatomic structure such as focal sclerotic change of sacrum (arrow) on soft-copy image (B). Mean value of diagnostic confidence was 3.8 on A and 4.9 on B.

View larger version (150K): [in a new window]   Fig. 2B. —53-year-old man with left-sided flank pain. Hard-copy (A) and soft-copy (B) radiographs of abdomen show tiny radiopaque density suggesting stone in left ureterovesical junction (open arrow). Note clearer visualization of urinary stone (open arrow) and anatomic structure such as focal sclerotic change of sacrum (arrow) on soft-copy image (B). Mean value of diagnostic confidence was 3.8 on A and 4.9 on B.

View larger version (139K): [in a new window]   Fig. 2C. —53-year-old man with left-sided flank pain. Excretory urography image obtained after voiding reveals stone (arrow) obstructing ureter in left ureterovesical junction.

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