A 200 CENTIMETER FOCAL SPOT‐FILM DISTANCE (FFD) TECHNIQUE FOR EQUINE THORACIC RADIOGRAPHY

Daniel A Feeney, Bradley J. Gordon, Gary R. Johnston, Susan L. McClanahan, Carl R. Jessen

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The construction of a variable kVp, variable mA radiographic technique chart for the equine thorax using linear regression analysis is described. The independent variables in the analysis were body weight (pounds) and thoracic girth (inches) and the dependent variables were the radiographic exposure techniques (mAs, kV.p). Four areas (lateral views only) of each horse's thorax were radiographed using a focal spot‐film distance (FFD) of 200 cm with the animal standing. The four views were craniodorsal, cranioventral, caudodorsal and caudoventral. For comparison, an additional caudodorsal view was made at 100 cm FFD to quantitate the decrease in exposure, the increased magnification and the decreased area of the lung exposed on the x‐ray tube side of the horse compared with 200 cm FFD technique. Body weight was a satisfactory means to determine radiographic technique factors for thoracic radiographs in the horse. Thoracic girth (inches) was also measured and used to determine radiographic technique factors but was less exacting and less convenient than body weight.

Original languageEnglish (US)
Pages (from-to)13-19
Number of pages7
JournalVeterinary Radiology
Volume23
Issue number1
DOIs
StatePublished - Jan 1982

Keywords

  • body weight
  • equine thorax
  • radiographic technique chart

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