Effect of Scanning Beam for Superficial Dose in Proton Therapy

Moskvin, V.; Estabrook, Neil C.; Cheng, Chee Wai; Das, Indra J.; Johnstone, Peter A.S.

doi:10.7785/tcrt.2012.500435

Cited by 8 publications

(5 citation statements)

References 23 publications

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“…The dosimetry associated with small proton fields and pencil beam spot scanning can be considered even more complex. The typical Bragg peak loses its characteristics as the field size is reduced 317 . EBT film can be used in measuring the 2D dose distributions and FWHM of pencil beam spots as part of the commissioning of the pencil beam spot scanning system 296 .…”

Section: Application Of Rcf Dosimetry In Clinical Radiation Therapymentioning

confidence: 99%

“…The typical Bragg peak loses its characteristics as the field size is reduced. 317 EBT film can be used in measuring the 2D dose distributions and FWHM of pencil beam spots as part of the commissioning of the pencil beam spot scanning system. 296 The low dose envelope of the spot profiles in 1D and 2D dose distributions can be measured using EBT3 RCF.…”

Section: D External Proton Beamsmentioning

confidence: 99%

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Report of AAPM Task Group 235 Radiochromic Film Dosimetry: An Update to TG‐55

et al. 2020

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The use of radiochromic film (RCF) dosimetry in radiation therapy is extensive due to its high level of achievable accuracy for a wide range of dose values and its suitability under a variety of measurement conditions. However, since the publication of the 1998 AAPM Task Group 55, Report No. 63 on RCF dosimetry, the chemistry, composition, and readout systems for RCFs have evolved steadily. There are several challenges in using the new RCFs, readout systems and validation of the results depending on their applications. Accurate RCF dosimetry requires understanding of RCF selection, handling and calibration methods, calibration curves, dose conversion methods, correction methodologies as well as selection, operation and quality assurance (QA) programs of the readout systems. Acquiring this level of knowledge is not straight forward, even for some experienced users. This Task Group report addresses these issues and provides a basic understanding of available RCF models, dosimetric characteristics and properties, advantages and limitations, configurations, and overall elemental compositions of the RCFs that have changed over the past 20 yr. In addition, this report provides specific guidelines for data processing and analysis schemes and correction methodologies for clinical applications in radiation therapy.

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Section: Application Of Rcf Dosimetry In Clinical Radiation Therapymentioning

confidence: 99%

Section: D External Proton Beamsmentioning

confidence: 99%

Report of AAPM Task Group 235 Radiochromic Film Dosimetry: An Update to TG‐55

et al. 2020

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“…As protons enter the body, they deposit dose slowly, resulting in a lower entrance dose compared to photons. However, the dose delivered to the skin and superficial targets with pencil beam scanning proton therapy, which is of particular importance in the setting of chest wall recurrences often involving the dermis and epidermis and requiring full prescription dose delivery to the skin, can be adequately modulated to reach the target prescription dose without the use of bolus [33]. In one dosimetric study, the mean skin surface dose was 72.2%, 70.9%, 98.1%, and 108.4% with the use of prone photons without bolus, supine photons without bolus, protons without bolus, and photons with bolus, respectively (p < 0.001) [34].…”

Section: Patient Selection and Rationale For Proton Therapymentioning

confidence: 99%

Proton Reirradiation for High-Risk Recurrent or New Primary Breast Cancer

Chakraborty,

Khan,

Cahlon

et al. 2023

Cancers

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Radiotherapy is an integral component of multidisciplinary breast cancer care. Given how commonly radiotherapy is used in the treatment of breast cancer, many patients with recurrences have received previous radiotherapy. Patients with new primary breast cancer may also have received previous radiotherapy to the thoracic region. Curative doses and comprehensive field photon reirradiation (reRT) have often been avoided in these patients due to concerns for severe toxicities to organs-at-risk (OARs), such as the heart, lungs, brachial plexus, and soft tissue. However, many patients may benefit from definitive-intent reRT, such as patients with high-risk disease features such as lymph node involvement and dermal/epidermal invasion. Proton therapy is a potentially advantageous treatment option for delivery of reRT due to its lack of exit dose and greater conformality that allow for enhanced non-target tissue sparing of previously irradiated tissues. In this review, we discuss the clinical applications of proton therapy for patients with breast cancer requiring reRT, the currently available literature and how it compares to historical photon reRT outcomes, treatment planning considerations, and questions in this area warranting further study. Given the dosimetric advantages of protons and the data reported to date, proton therapy is a promising option for patients who would benefit from the added locoregional disease control provided by reRT for recurrent or new primary breast cancer.

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“…This clinical advantage of the Bragg peak is modulated somewhat by the fact that increased biologic effects of the beam in the area of the Bragg peak are still being studied. 21 Regardless of the physics of the proton beam, the fact that it stops gives pause for another reason in children. We have published a range modulation "feathering" technique to allow for this to be performed safely.…”

Section: Clinicalmentioning

confidence: 99%

Practical Aspects of Pediatric Proton Radiation Therapy

McMullen¹,

Kerstiens²,

Johnstone³

2014

The Cancer Journal

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Many radiotherapy centers desire proton therapy (PrT) because the unique physical dosimetry allows for improved dose distribution in some clinical situations. These benefits are best described in skull base and many pediatric lesions. However, there are significant challenges to PrT that are overlooked or simply ignored when centers embark on the PrT journey particularly as it applies to pediatric patients.In this review, we review the Indiana University Health Proton Therapy Center experience regarding benefits and drawbacks of PrT for pediatric patients. In conclusion, centers aspiring to PrT capacity should be aware not only of the well-described benefits in some clinical scenarios, but also the significant challenges to the modality in its practical clinical application.

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Effect of Scanning Beam for Superficial Dose in Proton Therapy

Cited by 8 publications

References 23 publications

Report of AAPM Task Group 235 Radiochromic Film Dosimetry: An Update to TG‐55

Report of AAPM Task Group 235 Radiochromic Film Dosimetry: An Update to TG‐55

Proton Reirradiation for High-Risk Recurrent or New Primary Breast Cancer

Practical Aspects of Pediatric Proton Radiation Therapy

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