title: Trends in the use of radiology with inpatients: what has changed in a decade?
abstract: OBJECTIVE
  Our goal was to evaluate trends in the use of radiology with inpatients in the 10-year period of 1984-1993.
  
  
  METHODS
  We retrospectively reviewed administrative data from a 751-bed, tertiary care hospital between October 1, 1983, and September 30, 1993 (Fiscal years 1984-1993). We coded each study by imaging technique: CT, MR imaging, sonography, nuclear medicine, or conventional studies (plain films and fluoroscopy). Echocardiography, cardiac catheterization, and angioplasty procedures were omitted. The number of admissions per year was adjusted for severity of disease (case-mix-adjusted admission [CMA]). We used relative value units to evaluate workload changes during the study period. We assessed significance of trends using linear regression analysis.
  
  
  RESULTS
  The total number of imaging studies per CMA decreased during the study period (p = .0001). This was due to a decrease in the number of conventional studies (p = .0001) and sonograms per CMA (p = .02), despite significant increases in the numbers of CT (p = .005) and MR imaging (p = .0001) studies per CMA. No significant change existed in the number of nuclear medicine studies per CMA (p = .11). The global, professional, and technical relative value units per CMA rose during the latter half of the study.
  
  
  CONCLUSIONS
  The overall number of imaging studies per CMA decreased during the decade, despite a significant rise in the use of CT and MR imaging, suggesting that these new imaging techniques are replacing older ones. To control further increases in overall imaging costs, priority should be placed on understanding the patterns of use for CT and MR imaging techniques and curbing their inappropriate use.
authors.affiliation: Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: R
authors.initials: R
authors.lastname: Khorasani
authors.forename: P K
authors.initials: PK
authors.lastname: Goel
authors.forename: N M
authors.initials: NM
authors.lastname: Ma'luf
authors.forename: L A
authors.initials: LA
authors.lastname: Fox
authors.forename: S E
authors.initials: SE
authors.lastname: Seltzer
authors.forename: D W
authors.initials: DW
authors.lastname: Bates
mesh_terms: D000328:Adult; D003953:Diagnosis-Related Groups; D003952:Diagnostic Imaging / Q000706:statistics & numerical data* / Q000639:trends; D006801:Humans; D007297:Inpatients; D007902:Length of Stay; D010343:Patient Admission / Q000706:statistics & numerical data / Q000639:trends; D012189:Retrospective Studies