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Br J Radiol. 2014 Jul;87(1039):20130734. doi: 10.1259/bjr.20130734. Epub 2014 Apr 29.

Phase-contrast and magnification radiography at diagnostic X-ray energies using a pseudo-microfocus X-ray source.

Author information

1
1 Christie Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK.

Abstract

OBJECTIVE:

To investigate the use of conventional diagnostic X-ray tubes for applications in which specialist microfocus sources are normally required.

METHODS:

A conventional diagnostic X-ray tube was used in conjunction with a range of apertures to investigate improvements in spatial resolution using a line-pairs test object. Phase-contrast effects were investigated by varying source-to-object and object-to-receptor distances using a 2-French catheter as a clinically realistic test object.

RESULTS:

For magnification radiography using a computed radiography receptor and conventional X-ray tube with a 1-mm nominal focus size, the limiting spatial resolution was improved from 3.55 line-pairs per millimetre, for a conventional contact image, to 5.6 line-pairs per millimetre, for a ×2 magnified view with a 250-µm aperture. For inline phase-contrast radiography, phase contrast enhancement of a 2-French catheter was demonstrated, and the expected trends with variations in source-to-object and object-to-receptor distances were found. Images of a neonatal phantom demonstrated a subtle improvement in visibility of a superimposed 1-French catheter simulating a percutaneously inserted central catheter for no increase in patient radiation dose.

CONCLUSION:

Spatial resolution improvement and visible phase contrast can be produced in clinically relevant objects using a pseudo-microfocus geometry at X-ray energies in the normal diagnostic range, using conventional diagnostic X-ray tubes and image receptors. The disadvantages of the proposal are the large distances required to produce phase contrast and limitations imposed by the resulting tube loading.

ADVANCES IN KNOWLEDGE:

It is possible to use conventional diagnostic X-ray equipment in applications that normally require microfocus X-ray sources. This presents some possibilities for clinical applications.

PMID:
24779409
PMCID:
PMC4075579
DOI:
10.1259/bjr.20130734
[Indexed for MEDLINE]
Free PMC Article
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