Physician Training Requirements in Sonography
How Many Cases Are Needed for Competence?
Barbara S. Hertzberg1,
Mark A. Kliewer,
James D. Bowie,
Barbara A. Carroll,
David H. DeLong,
Linda Gray and
Rendon C. Nelson
1
All authors: Department of Radiology, Box 3808, Rm. 2526, Blue Zone, South,
Duke University Medical Center, Durham, NC 27710.

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Fig. 1. Line graph shows improvement in average percentage of anatomy
depicted on competency tests administered after involvement in increasing
increments of case volumes.
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Fig. 2. Line graph shows decrease in average number of total reporting
errors per case on competency tests administered after involvement in
increasing increments of case volumes.
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Fig. 3. Line graph shows decrease in average number of clinically
significant reporting errors per case on competency tests administered after
involvement in increasing increments of case volumes.
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Fig. 4. Line graph shows improvement in average percentage of cases in which
residents achieved passing score on competency tests administered after
involvement in increasing increments of case volumes.
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Fig. 5. Line graph shows percentage of anatomic landmarks depicted by
individual residents on competency tests administered after involvement in
each of four increments of case volumes. Key on right shows symbols used to
depict each of 10 residents (residents A-J). Note striking differences in
performance of individual residents.
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Fig. 6. Line graph shows average number of total errors per case made by
individual residents on competency tests administered after involvement in
each of four increments of case volumes. Key on right shows symbols used to
depict each of 10 residents (residents A-J).
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Fig. 7. Line graph shows average number of clinically significant reporting
errors per case made by individual residents on competency tests administered
after involvement in each of four increments of case volumes. Key on right
shows symbols used to depict each of 10 residents (residents A-J).
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Fig. 8. Line graph shows percentage of cases passed by individual residents
on competency tests administered after involvement in each of four increments
of case volumes. Key on right shows symbols used to depict each of 10
residents (residents A-J). Note that lines demarcating scores that are
superimposed on baseline (0% of cases passed) have been offset slightly so
they are visible.
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Copyright © 2000 by the American Roentgen Ray Society.