| dc.creator | KalefEzra, J. A. | en |
| dc.creator | Karantanas, A. H. | en |
| dc.date.accessioned | 2015-11-23T10:31:03Z | |
| dc.date.available | 2015-11-23T10:31:03Z | |
| dc.date.issued | 1996 | |
| dc.identifier.issn | 0284-1851 | |
| dc.identifier.uri | http://hdl.handle.net/11615/28770 | |
| dc.description.abstract | Purpose: In an attempt to improve field uniformity and CT number stability, the software in a CT scanner was replaced with a new version. The purpose of the present study was to investigate the influence of the software upgrading on density measurements. Material and Methods: The upgrading influence was investigated by means of a torso phantom (European spinal). The phantom simulates a torso which contains 3 vertebrae of different densities. Results: Despite the use of a reference standard under the phantom, the software change resulted in: a) improved short-term precision; b) increased density values at 80 and 100 kVp, decreased at 130 kVp; and c) increased influence of the kVp on the values. Conclusion: The results of the present study suggest that conversion factors have to be used in density values for reference populations as well as in the values of patients undergoing follow-up studies. | en |
| dc.source.uri | <Go to ISI>://WOS:A1996VZ65900004 | |
| dc.subject | computed tomography, quantitative | en |
| dc.subject | bone mineral density | en |
| dc.subject | radiation | en |
| dc.subject | therapy | en |
| dc.subject | software | en |
| dc.subject | CALIBRATION STANDARDS | en |
| dc.subject | COMPUTED-TOMOGRAPHY | en |
| dc.subject | BONE | en |
| dc.subject | DENSITOMETRY | en |
| dc.subject | PHANTOM | en |
| dc.subject | LIQUID | en |
| dc.subject | Radiology, Nuclear Medicine & Medical Imaging | en |
| dc.title | Software upgrading in a CT scanner - Influence on quantitative CT | en |
| dc.type | journalArticle | en |
