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Fig. 1A. Changes in distribution among techniques between 1973 and 1997. Bar
charts show percentage of diagnostic examinations (A) and
resource-based relative value units (B) by category: gray areas
indicate general imaging, white indicates sectional imaging, and black
indicates special imaging. Codes for surgery, nuclear medicine, radiation
therapy, support, and visits are excluded from these charts. Data for 1973 and
1980 are reprinted with permission from
[6]; data for 1989 are
reprinted from [2]; and data
for 1993, 1995, and 1997 are from American Society of Clinic Radiologists
manpower surveys (Conoley PM, unpublished data).
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