The effect of carbon fibre inserts on the build-up and attenuation of high energy photon beams

Ost, B. De; Vanregemorter, J.; Schaeken, B.; Weyngaert, D. Van den

doi:10.1016/s0167-8140(97)00118-7

Cited by 55 publications

(53 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The measured attenuation factor at central axis (CAX) for normal incidence is consistent with the published results. ( 10 , 11 ) As would be expected, attenuation increases with increasing beam angle of incidence and reaches as high as 8.7% at CAX at 55° incidence. Table 1 also shows good agreement between the measured and calculated attenuation factors at CAX, as well as the mean attenuation over the central 80% of the field size.…”

Section: Resultssupporting

confidence: 60%

“…Prior to the use of the carbon fiber, the conventionally used materials for treatment couch top were PMMA and wood, which cause more attenuation than carbon fiber. De Ost et al ( 10 ) showed the attenuation up to 4% by either 12.5 mm PMMA plate or 19 mm wooden hardboard at normal incidence for 6 MV beams. Munjal et al ( 11 ) observed the attenuation by a 12 mm PMMA plate ranging from 4.85% at normal incidence to 10.55% at 60° incidence.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluating and modeling of photon beam attenuation by a standard treatment couch

Dai

et al. 2011

J Applied Clin Med Phys

View full text Add to dashboard Cite

The purpose of this study was to evaluate beam attenuation by treatment couch and build a treatment couch model in TPS to check for beam–couch intersection at the planning stage and deal with beam attenuation by treatment couch in dose calculation. In this study, a standard treatment couch, Siemens ZXT couch, has been incorporated into Pinnacle3 8.0 TPS, based on an existing TPS tool, model‐based segmentation (MBS). This was done by generating the couch's model from contours of the couch, together with the density information. Both the geometric and dosimetric accuracy of the couch model were evaluated. The test of beam–couch intersection prediction showed good agreement between predicted and measured results, and the differences were within 1° gantry rotation. For individual posterior oblique beams, the attenuation by metallic frames and PMMA couch top could reach nearly as high as 60% and 10%, respectively. For several posterior oblique beams (180°, 220°, 235°) that attenuated by the PMMA couch top, the calculated and measured dose distributions were compared. The dose differences at central axis were within 1%, and almost all points agreed with the calculations when the DD and DTA criteria of 3%/3 mm were adopted. The difference between calculated and measured attenuation factors were within 0.5%. This study demonstrates that the couch model created by MBS, which contains geometric and density information of the couch, can be used to detect the beam–couch intersection, and also is able to provide an accurate representation of the couch top attenuation properties in patient dose calculation.PACS numbers: 87.55.D‐, 87.55.Gh, 87.55.km

show abstract

Section: Resultssupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Evaluating and modeling of photon beam attenuation by a standard treatment couch

Dai

et al. 2011

J Applied Clin Med Phys

View full text Add to dashboard Cite

show abstract

“…For different inserts De Ost et al [5] found similar increased dose values right beyond the surface of the phantom. For 6-MV photon beams, the surface dose due to the insert increased by a factor of 1.79.…”

Section: Discussionmentioning

confidence: 78%

“…Besides, there is reduced distortion in dose distribution within the target volume as described by Bratengeier et al [3]. De Ost et al [5] showed that carbon-fiber insert couches were better suited than PMMA (polymethylmethacrylate) and wooden hardboards when used as tabletops. Studies by Meara & Langmack [11] involving the implementation of other support devices in addition to the carbon-fiber couch insert also showed that the photon-beam attenuation for their tabletops was insignificant.…”

Section: Introductionmentioning

confidence: 96%

The Effect of a Carbon-Fiber Couch on the Depth-Dose Curves and Transmission Properties for Megavoltage Photon Beams

et al. 2007

View full text Add to dashboard Cite

show abstract

“…( 2 ) Photon beam attenuation properties of carbon fiber couch inserts have been studied by several investigators. ( 3 – 13 ) Higgins et al ( 4 ) measured a relative increase of 375% in surface dose with 8 MV photons when a carbon fiber insert panel (Sinmed BV) was added to a

10 \times 10 {cm}^{2}

beam. McCormack et al ( 6 ) measured a significant increase in beam attenuation ranging from 2.0% at 0° to 8.7% at 70° with the studied Sinmed BV Posisert carbon fiber couch insert, whereas Poppe et al ( 9 ) measured an attenuation of 2.7% at 0° with a RM2/4 tabletop in the

15 \times 15 {cm}^{2}

beam.…”

Section: Introductionmentioning

confidence: 99%

Increased beam attenuation and surface dose by different couch inserts of treatment tables used in megavoltage radiotherapy

Seppälä

Kulmala

2011

J Applied Clin Med Phys

View full text Add to dashboard Cite

The use of solid carbon fiber table materials in radiotherapy has become more common with the implementation of image‐guided radiotherapy (IGRT), since the solid materials give less imaging artifacts than the so‐called tennis racket couchtops. The downside of the solid carbon fiber couch inserts is that they increase the beam attenuation, resulting in increased surface doses and inaccuracies in determine the dose in the patient. The purpose of this study was to evaluate the interaction of 6 and 15 MV photons with eight different couch inserts. The presented results enable direct comparison of the attenuation properties of the studied couchtops. With a direct posterior beam the maximum attenuations reach 3.6% and 2.4% with 6 and 15 M V, respectively. The measured maximum attenuation by a couchtop with an oblique gantry angle was 10.8% and 7.4% at 6 and 15 MV energies, respectively. The skin‐sparing effect was decreased substantially with every couchtop. The highest increases in surface doses were recorded to be four‐ and threefold, as compared to the direct posterior open field surface doses of 6 and 15 MV, respectively. In conclusion, the carbon fiber tabletops decrease the skin‐sparing effect of megavoltage photon energies. The increased beam attenuation and skin doses should be taken into account in the process of treatment planning.PACS number: 07.90.+c

show abstract

The effect of carbon fibre inserts on the build-up and attenuation of high energy photon beams

Cited by 55 publications

References 6 publications

Evaluating and modeling of photon beam attenuation by a standard treatment couch

Evaluating and modeling of photon beam attenuation by a standard treatment couch

The Effect of a Carbon-Fiber Couch on the Depth-Dose Curves and Transmission Properties for Megavoltage Photon Beams

Increased beam attenuation and surface dose by different couch inserts of treatment tables used in megavoltage radiotherapy

Contact Info

Product

Resources

About