Kilovoltage measurement with rhodium target and filters on mammography X-ray machines

Underwood, Adam; J, Law; Goodman, D A; Robinson, Art; Rust, Alistair G.

doi:10.1259/0007-1285-69-824-769

Cited by 3 publications

(1 citation statement)

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“…Any failings on that score would have been shown up very quickly by these kV meters, but an instance is known of an x-ray unit giving a reading of 28.1 kV for 28 kV set on every check at 3 months intervals for its first 2 years in quite intensive use for screening. The best-known kV meter in the UK in this period was the RMI 232 (Radiation Measurements Inc, WI); its convenience and reliability made it everyone's favourite (Underwood et al 1996).…”

Section: Instrumentation For Performance Checksmentioning

confidence: 99%

The development of mammography

J¹

2006

Phys. Med. Biol.

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This review traces the development of mammography physics over the last 50 years, concentrating mainly on technological changes and their inter-relations. It has been written for physicists with no specific mammography experience but a general interest in radiology, as much as for those with recent involvement in mammography. Topics covered include industrial film, xerography, intensifying screens, x-ray tube developments, image quality test objects, patient dose and performance checks. Some of these developments were necessary before population screening of healthy women could be considered, while others have resulted from increased opportunities for equipment manufactures which screening programmes created. The standpoint of this review is that of a physicist with long experience in a UK centre where mammography was performed on dedicated equipment well over 40 years ago and where screening has been performed continuously for 30 years.

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Section: Instrumentation For Performance Checksmentioning

confidence: 99%

The development of mammography

J¹

2006

Phys. Med. Biol.

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Experimental determination of practical peak voltage.

Baorong

Kramer²,

Selbach³

et al. 2000

The British Journal of Radiology

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In diagnostic radiology the practical peak voltage was initially derived by postulating that, for a given combination of X-ray tube and contrast geometry, a constant X-ray tube voltage should produce the same low level contrast as an arbitrarily pulsating X-ray tube voltage. It has been shown previously that the practical peak voltage can be properly defined as a weighted average of the X-ray tube voltage. Up to now the concept of practical peak voltage was based entirely on the results of calculations. The present paper describes the experimental investigations for measuring and comparing the contrast-equivalent X-ray tube voltage and practical peak voltage derived from an invasive measurement of the time-dependent X-ray tube voltage. Within the experimental uncertainties, the results demonstrate the mutual equivalence of the practical peak voltage and the contrast-equivalent X-ray tube voltage.

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A parametric method for determining mammographic X‐ray tube output and half value layer

Robson

2001

BJR

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In the National Health Service Breast Screening Programme, regular assessment of the mean glandular doses received by a group of women is recognized as an important part of a quality assurance programme. The use of different tube voltages, to improve the beam penetration for thick or dense breasts, and of X-ray units with programmable exposure modes, requires a large number of measurements to ensure that all the values of tube output and half value layer required for the dose calculations are available. In this work, a computer model is used to produce data that allow the calculation of tube output and half value layer for the range of clinically encountered conditions from measurements routinely obtained during quality assurance tests. The data are given as a series of equations and parameters, enabling the calculations to be easily incorporated into a dose calculation spreadsheet. The results of an experimental verification of the model are presented, showing good agreement between the measured and predicted values of half value layer and tube output for a range of combinations of target, filter and tube voltage.

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Kilovoltage measurement with rhodium target and filters on mammography X-ray machines

Cited by 3 publications

References 1 publication

The development of mammography

The development of mammography

Experimental determination of practical peak voltage.

A parametric method for determining mammographic X‐ray tube output and half value layer

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