2015
DOI: 10.1007/s13246-015-0327-8
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Use of a megavoltage electronic portal imaging device to identify prosthetic materials

Abstract: To achieve accurate dose calculations in radiation therapy the electron density of patient tissues must be known. This information is ordinarily gained from a computed tomography (CT) image that has been calibrated to allow relative electron density (RED) to be determined from CT number. When high density objects such as metallic prostheses are involved, direct use of the CT data can become problematic due to the artefacts introduced by high attenuation of the beam. This requires manual correction of the densi… Show more

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Cited by 13 publications
(9 citation statements)
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“…This becomes more challenging when implementing a dual printing process or when using variable infill densities throughout a phantom. A range of clinical TPSs also require RED for dose calculation but the differences between RED and RED eff are not easy, or often possible, to determine without radiological measurement 13 . A feasible alternate approach during the production of phantoms could be able to generate phantom‐specific CT conversion curves as suggested in Figure 3.…”
Section: Discussionmentioning
confidence: 99%
See 2 more Smart Citations
“…This becomes more challenging when implementing a dual printing process or when using variable infill densities throughout a phantom. A range of clinical TPSs also require RED for dose calculation but the differences between RED and RED eff are not easy, or often possible, to determine without radiological measurement 13 . A feasible alternate approach during the production of phantoms could be able to generate phantom‐specific CT conversion curves as suggested in Figure 3.…”
Section: Discussionmentioning
confidence: 99%
“…Physical density of the sample objects was determined by measurement, assuming homogeneity. The effective electron density (RED eff ) as described by Moutrie, was derived using the method described by Van der Walt et al using a CC04 chamber 13,14 . Previous works by Tello and Allahverdi have shown plastic water to perform within 0.5% of water for a 6 MV beam, and so no further corrections were applied to convert between plastic and real water thickness 15,16 …”
Section: Methodsmentioning
confidence: 99%
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“…After observing that the MV CT produced dramatically different radiodensity results from the kV CT of the sample (see Section 3.1), additional radiodensity measurements were performed using a narrow (3 × 3 cm 2 ) 6 MV radiotherapy beam from a Varian Clinac 21iX (Varian Medical Systems, Palo Alto, USA), to investigate the consistency of results between using the MV CT imaging system and the MV treatment beam. A method described by Moutrie et al [6] was used to identify the "effective" relative electron density, (ρ e /ρ e,w ) eff , which is the ρ e /ρ e,w of the sample as identified using an electronic portal imaging device (EPID), for the particular therapy beam and the particular scatter conditions used to acquire the EPID image. Moutrie et al's method was also adapted as described by Dancewicz et al [7], to allow the (ρ e /ρ e,w ) eff assessment to be verified using measurements performed with a Roos ionization chamber (type 34001, PTW, Freiburg, Germany).…”
Section: Radiodensity Characterisationmentioning
confidence: 99%
“…For both the EPID measurements and the Roos chamber measurements, the water equivalent thickness of the physical sample (i.e. the thickness of water providing equivalent attenuation), t w , was measured using comparisons with Virtual Water (Standard Imaging Inc, Middleton, USA) transmission measurements, and (ρ e /ρ e,w ) eff was calculated by division of t w by the physical thickness of sample, t, as described by Moutrie et al and Dancewicz et al [6,7].…”
Section: Radiodensity Characterisationmentioning
confidence: 99%