Checking diagnostic X-ray beam quality

Ardran, G. M.; Crooks, H. E.

doi:10.1259/0007-1285-41-483-193

Cited by 58 publications

(16 citation statements)

References 7 publications

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“…We have previously shown (Ardran and Crooks, 1967) that if one measures the quality variation of an X-ray beam across the tube window in the anode/ cathode direction that the peak keV remains the same but the mean keV varies; this confirms the work of Zintheo (1937). This is attributed to the fact that X rays produced deep to the surface of the target are more heavily filtered before leaving the target the smaller the effective target angle.…”

supporting

confidence: 73%

The measurement of inherent filtration in diagnostic X-ray tubes and the effect of target angle on X-ray quality

Ardran¹,

Crooks²

1972

BJR

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Radiation protection recommendations give requirements for nitration of X-ray tubes, and to conform with these it is necessary to know the inherent filtration. Methods described for its determination and the discrepancies in the results given by reputable authors are discussed. Output measurements given in handbooks of standard data may be misleading if compared with such data for tubes for which the inherent filtration is in doubt. The importance of the correct effective kV at which measurements are made is discussed. The target angle of the tube has an important effect in altering X-ray quality. If the same target angle is not used for both calibration and measurements, discrepancies can result which can easily lead to an erroneous value of inherent filtration of between 0-25 and 0-5 mm of aluminium equivalent. A procedure is described using our copper reference number method which enables calibration curves to be obtained so that the inherent or total filtration of an X-ray tube may simply be determined with an accuracy better than 0-1 mm Al equivalent.

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supporting

confidence: 73%

The measurement of inherent filtration in diagnostic X-ray tubes and the effect of target angle on X-ray quality

Ardran¹,

Crooks²

1972

BJR

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“…The nominal tube focus was 1 mm x 1 mm. The tube potential was controlled with a penetrameter (ARDRAN & CROOKS 1968). Ilford Rapid R film and CEA universal intensifying screens were used.…”

Section: Methodsmentioning

confidence: 99%

Experimental Evaluation of Tube Potential and Contrast Medium Concentration for Cholangiography

Lundström¹,

Rydh²,

Wickman³

1976

Acta Radiologica. Diagnosis

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Model cholangiographic experiments were performed in which the relationship between contrast medium concentration, duct diameter, calculus size and tube potential was analysed. The same degree of diagnostic reliability was obtained by increasing the tube potential as by diluting the contrast medium. A tube potential of 100 to 110 kV and a contrast medium concentration of 45 per cent were found to give the best result if the background density of the film was held constant.

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“…Today's diagnostic medical x-ray QA instruments uses a different method, the principle of which is that the tube voltage is correlated to the dose ratio of the same x-ray beam passing through different attenuators. [2][3][4] Instruments using this method for tube voltage measurement employs a pair of matched detectors filtered by different attenuators. The ratio of the detector response from both detectors depends on the beam quality (energy spectrum) of the x-ray beam; hence, a tube voltage value can be reported by matching the ratio to a calibration look-up table in the instrument.…”

Section: Introductionmentioning

confidence: 99%

Verification of a novel method for tube voltage constancy measurement of orthovoltage x‐ray irradiators

et al. 2014

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Purpose:For orthovoltage x-ray irradiators, the tube voltage is one of the most fundamental system parameters as this directly relates to the dosimetry in radiation biology studies; however, to the best of our knowledge, there is no commercial portable quality assurance (QA) tool to directly test the constancy of the tube voltage greater than 160 kV. The purpose of this study is to establish the Beam Quality Index (BQI), a quantity strongly correlated to the tube voltage, as an alternative parameter for the verification of the tube voltage as part of the QA program of orthovoltage x-ray irradiators. Methods: A multipurpose QA meter and its associated data acquisition software were used to customize the measurement parameters to measure the BQI and collect its time-plot. BQI measurements were performed at 320 kV with four filtration levels on three orthovoltage x-ray irradiators of the same model, one of which had been recently energy-calibrated at the factory. Results: For each of the four filtration levels, the measured BQI values were in good agreement (<5%) between the three irradiators. BQI showed filtration-specificity, possibly due to the difference in beam quality. Conclusions:The BQI has been verified as a feasible alternative for monitoring the constancy of the tube voltage for orthovoltage irradiators. The time-plot of BQI offers information on the behavior of beam energy at different phases of the irradiation time line. In addition, this would provide power supply performance characteristics from initial ramp-up to plateau, and finally, the sharp drop-off at the end of the exposure.

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Checking diagnostic X-ray beam quality

Cited by 58 publications

References 7 publications

The measurement of inherent filtration in diagnostic X-ray tubes and the effect of target angle on X-ray quality

The measurement of inherent filtration in diagnostic X-ray tubes and the effect of target angle on X-ray quality

Experimental Evaluation of Tube Potential and Contrast Medium Concentration for Cholangiography

Verification of a novel method for tube voltage constancy measurement of orthovoltage x‐ray irradiators

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