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A 200 CENTIMETER FOCAL SPOT‐FILM DISTANCE (FFD) TECHNIQUE FOR EQUINE THORACIC RADIOGRAPHY
Author(s) -
Feeney Daniel A.,
Gordon Bradley J.,
Johnston Gary R.,
McClanahan Susan L.,
Jessen Carl R.
Publication year - 1982
Publication title -
veterinary radiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.541
H-Index - 60
eISSN - 1740-8261
pISSN - 0196-3627
DOI - 10.1111/j.1740-8261.1982.tb00702.x
Subject(s) - radiography , thorax (insect anatomy) , nuclear medicine , magnification , medicine , radiology , anatomy , physics , optics
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.