A technique for undertaking macroradiography on conventional radiographic equipment without increased geometric unsharpness

S. Bowman, Rob DAVIDSON

Research output: Contribution to journalArticle


Macroradiography is a technique which employs geometric factors to produce magnified radiographic images. To reduce the amount of geometric unsharpness special x-ray tubes with small focal spot sizes have been employed. This type of equipment is expensive and has limited the use of macroradiography. This paper describes a method that uses standard x-ray equipment to produce macroradiographs. The effective focal spot size of the tube varies across the primary beam being smallest at the anode end of the beam. By angling the x-ray tube toward the cathode an effective focal spot sizes of 0.1 mm2 in the longitudinal direction can be achieved from a standard x-ray tube with an effective focal spot size of 0.6 mm2. A 0.6 mm2 tube can only produce quality macroradiographs of up to 1.5X magnification. By employing this x-ray tube orienting technique magnifications of up to 4X can be achieved. The aim of this paper is to describe the technique for clinical application. Further investigation is taking place into the characteristics of the beam and dosimetry.
Original languageEnglish
Pages (from-to)41-44
Number of pages4
JournalThe Radiographer
Issue number1
Publication statusPublished - 2003
Externally publishedYes


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