Dosimetric Verification of the Dynamic Intensity-Modulated Radiation Therapy of 92 Patients

Tsai, Jason Sheng‐Hong; Wazer, David E.; Ling, Marilyn N.; Wu, Julian K.; Fagundes, Marcio; DiPetrillo, Thomas A.; Kramer, Bradley; Koistinen, Melita; Engler, Mark J.

doi:10.1016/s0360-3016(98)00009-1

Cited by 125 publications

(72 citation statements)

References 41 publications

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“…Due to the complexity of the planning and treatment delivery process of IMRT, it is crucial to perform dosimetric quality assurance for each patient plan 1 , 2 . With the increased utilization of IMRT techniques, the modern RT department is facing an enormous quality assurance workload burden for patient specific treatment plan validation.…”

Section: Introductionmentioning

confidence: 99%

Image guided IMRT dosimetry using anatomy specific MOSFET configurations

Amin

Norrlinger

Heaton

et al. 2008

J Applied Clin Med Phys

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We have investigated the feasibility of using a set of multiple MOSFETs in conjunction with the mobileMOSFET wireless dosimetry system, to perform a comprehensive and efficient quality assurance (QA) of IMRT plans. Anatomy specific MOSFET configurations incorporating 5 MOSFETs have been developed for a specially designed IMRT dosimetry phantom. Kilovoltage cone beam computed tomography (kV CBCT) imaging was used to increase the positional precision and accuracy of the detectors and phantom, and so minimize dosimetric uncertainties in high dose gradient regions. The effectiveness of the MOSFET based dose measurements was evaluated by comparing the corresponding doses measured by an ion chamber. For 20 head and neck IMRT plans the agreement between the MOSFET and ionization chamber dose measurements was found to be within −0.26±0.88% and 0.06±1.94% (1σ) for measurement points in the high dose and low dose respectively. A precision of 1 mm in detector positioning was achieved by using the X‐Ray Volume Imaging (XVI) kV CBCT system available with the Elekta Synergy Linear Accelerator. Using the anatomy specific MOSFET configurations, simultaneous measurements were made at five strategically located points covering high dose and low dose regions. The agreement between measurements and calculated doses by the treatment planning system for head and neck and prostate IMRT plans was found to be within 0.47±2.45%. The results indicate that a cylindrical phantom incorporating multiple MOSFET detectors arranged in an anatomy specific configuration, in conjunction with image guidance, can be utilized to perform a comprehensive and efficient quality assurance of IMRT plans.PACS number: 87.55.Qr

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Section: Introductionmentioning

confidence: 99%

Image guided IMRT dosimetry using anatomy specific MOSFET configurations

Amin

Norrlinger

Heaton

et al. 2008

J Applied Clin Med Phys

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“…Such comparisons are, however, valuable and available in the literature (14) . Additionally, in an effort to reduce the number of variables influencing the ultimate outcome, comparisons of calculated fluence to actual fluence using matrix arrays, and their subsequent gamma analysis, are not used in this study 15 , 16 , 17 , 18 , 19 …”

Section: Introductionmentioning

confidence: 99%

The clinical impact of detector choice for beam scanning

Gersh

Best

Watts³

2014

J Applied Clin Med Phys

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Recently, the developers of Eclipse have recommended the use of ionization chambers for all profile scanning, including for the modeling of VMAT and stereotactic applications. The purpose of this study is to show the clinical impact caused by the choice of detector with respect to its ability to accurately measure dose in the penumbra and tail regions of a scanned profile. Using scan data acquired with several detectors, including an IBA CC13, a PTW 60012, and a Sun Nuclear EDGE Detector, three complete beam models are created, one for each respective detector. Next, using each beam model, dose volumes are retrospectively recalculated from actual anonymous patient plans. These plans include three full‐arc VMAT prostate plans, three left chest wall plans delivered using irregular compensators, two half‐arc VMAT lung plans, three MLC‐collimated static‐field pairs, and two SBRT liver plans. Finally, plans are reweighted to deliver the same number of monitor units, and mean dose‐to‐target volumes and organs at risk are calculated and compared. Penumbra width did not play a role. Dose in the tail region of the profile made the largest difference. By overresponding in the tail region of the profile, the 60012 diode detector scan data affected the beam model in such a way that target doses were reduced by as much as 0.4% (in comparison to CC13 and EDGE data). This overresponse also resulted in an overestimation of dose to peripheral critical structure, whose dose consisted mainly of scatter. This study shows that, for modeling the 6 MV beam of Acuros XB in Eclipse Version 11, the choice to use a CC13 scanning ion chamber or an EDGE Detector was an unimportant choice, providing nearly identical models in the treatment planning system.PACS number: 87.55.kh

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“…For the effectiveness and success of the treatment prescribed,a high spatial and dosimetric accuracy during treatment delivery is of crucialimportance.Therefore, particular quality assurance (QA) procedureshave been developed together with those increasingly sophisticatedtreatment techniques [1]- [3], which wouldinclude the verification of absolute doses at one or more reference points as well as of twodimensionaldose distributions in different planes in awater-equivalent phantom.…”

Section: Introductionmentioning

confidence: 99%

Wiener Filter Used in the EBT2 Film for Radiation Therapy

Chang¹

2013

IJCEA

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Abstract-EBT2 film has been widely used in the dosimetry application of radiation therapy with lots of benefits especially its self-development, water equivalent, energy independent and high spatial resolution. However, the higher inhomogeneity between the pixels of EBT2 image, needed to be averaged out according to the traditional method, but it could sacrifice the spatial resolution. The Wiener filter technique was introduced in this paper. The EBT2 film was calibrated by using the PDD method and the film calculate doses were compared with the measurement doses by the edge detector with the water phantom. The results demonstrate that the Wiener filter technique has higher accuracy than the traditional method and it would not sacrifice the high spatial resolution of EBT2 film. This method can also be applied to all the quality assurances of treatment planning of radiationtherapy by using EBT2 film.

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Dosimetric Verification of the Dynamic Intensity-Modulated Radiation Therapy of 92 Patients

Cited by 125 publications

References 41 publications

Image guided IMRT dosimetry using anatomy specific MOSFET configurations

Image guided IMRT dosimetry using anatomy specific MOSFET configurations

The clinical impact of detector choice for beam scanning

Wiener Filter Used in the EBT2 Film for Radiation Therapy

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