Scattered Radiation in a Phantom from Diagnostic Quality Radiation

Ed, Trout; Jp, Kelly

doi:10.1148/85.3.546

Cited by 8 publications

(3 citation statements)

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“…Since it is well known that x-ray tube leakage is low, it was not specifically investigated. Scatter by air was assumed to be negligible 10 and preliminary measurements demonstrated that image receptor scatter was negligible. Finally, accessory radiation shields were not considered in this work and were, therefore, removed from all systems tested.…”

Section: Methodsmentioning

confidence: 99%

“…Physical radiation protection practices in interventional radiology and cardiology are predicated on the tenet that occupational radiation exposure is primarily due to scatter from the patient . However, as early as 1965, Trout and Kelley characterized the contributions of scatter originating from x‐ray beam spectral filters, collimators, and the collimator assembly cover to a patient‐simulating phantom . In 2004, McVey et al used Monte Carlo simulation to estimate scatter originating from within a simulated air kerma‐area product (KAP) meter .…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9] However, as early as 1965, Trout and Kelley characterized the contributions of scatter originating from x-ray beam spectral filters, collimators, and the collimator assembly cover to a patient-simulating phantom. 10 In 2004, McVey et al used Monte Carlo simulation to estimate scatter originating from within a simulated air kerma-area product (KAP) meter. 11 In 2011, Struelens et al studied scatter originating from Cu and Al spectral filters and collimators and concluded that "the largest contribution of the exposure of medical staff comes from scattered radiation from the patient".…”

Section: Introductionmentioning

confidence: 99%

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Technical Note: Assessment of scatter originating from the x‐ray tube collimator assembly of modern angiography systems

et al. 2019

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Purpose While scatter from the patient is assumed to be the primary source of occupational radiation dose associated with fluoroscopically guided interventional procedures, the potential contribution of scatter from the x‐ray collimator assembly is unknown. The purpose of this work was to survey clinical x‐ray angiography systems to assess the potential contribution of collimator assembly scatter on occupational radiation dose. Methods Experimental methods were designed to measure the relative contributions of scatter originating from within the collimator assembly of the x‐ray tube to total scatter, which included scatter from a patient‐simulating phantom. Measurements were acquired as a function of lateral distance from the x‐ray beam center using a posterior anterior (PA) projection and at a fixed location for variable right anterior oblique to left anterior oblique projections in the range −90º to 90º. For one system, the collimator assembly was partially disassembled to assess the scatter contribution of individual components. For two systems, 0.5 mm Pb was added to the inner surface of the collimator assembly cover and tested for efficacy to block collimator assembly scatter. Results Considering all x‐ray systems and only the PA projection, collimator assembly scatter contributed 20–50% to total scatter. For x‐ray projection angles of −90º to 90º, the relative contribution of collimator assembly to total scatter was dependent on projection angle and ranged from 5% to 56%. X‐ray systems with kerma‐area product meters demonstrated higher collimator assembly scatter than those without. Considering all projection angles, the addition of 0.5 mm Pb to the inside of the collimator assembly cover reduced collimator assembly scatter from 28% to 16% of total scatter for both systems. Conclusion Findings from this work suggest that contemporary radiation safety practices and guidelines should be revised to account for scatter originating from the collimator assembly of angiographic x‐ray tubes.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Technical Note: Assessment of scatter originating from the x‐ray tube collimator assembly of modern angiography systems

et al. 2019

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Assessment of stray radiation outside the main beam of the RUM-17 radiological device

Васильев¹,

El'tsov²

1992

Biomed Eng

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A film-thermoluminescent dosimetry method for predicting body doses due to diagnostic radiography

Vacirca

Pasternack

Blatz

1972

pmb

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4 technique for obtaining a continuous dose distribution in a phantom exposed t o x-rays has been dovelopod and applied to assess the dose in man resulting from radiographic examinations. Film packets and LiF thermoluminescent microdosemeters arc sandwiched lmtwoen the transverse sections of a phantom ant1 exposed to typical diagnostic x-ray procedures. Information obtained from calibration graphs and from the air (lose o n the phantom surface at the centre of tho useful beam permits the construction of isodose curves directly on film. The isodose curves are superimposed on drawings of t h e appropriate anatomical crosi-sections.IVhen the drawings are arrangrtt in proper sequence a three tlimcn4onal distribution is obtained. Dose a$sessments based on this distribution were compared with those obtained by other methods. The relative dose a t specific point sites agreed well with data obtained by other investigators using miniature ionization chambors.For continuous dose distribution the present method proved superior t o other methods.

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Scattered Radiation in a Phantom from Diagnostic Quality Radiation

Cited by 8 publications

References 0 publications

Technical Note: Assessment of scatter originating from the x‐ray tube collimator assembly of modern angiography systems

Technical Note: Assessment of scatter originating from the x‐ray tube collimator assembly of modern angiography systems

Assessment of stray radiation outside the main beam of the RUM-17 radiological device

A film-thermoluminescent dosimetry method for predicting body doses due to diagnostic radiography

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