Randomized trial on two types of thermoplastic masks for patient immobilization during radiation therapy for head-and-neck cancer

Sharp, Lena; Lewin, Freddi; Johansson, Hemming; Payne, David G.; Gerhardsson, A.; Rutqvist, Lars Erik

doi:10.1016/j.ijrobp.2004.04.047

Cited by 65 publications

(54 citation statements)

References 17 publications

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“…4. Skin toxicity has previously been evaluated in a randomized trial evaluating thermoplastic head masks vs. head-and-shoulder masks (11). The head-and-shoulder group had significantly more acute skin toxicity for patients receiving 60 Gy or greater.…”

Section: Discussionmentioning

confidence: 99%

“…Thermoplastic masks have previously been shown in both prospective randomized and retrospective studies to have setup accuracy on the order of a few millimeters (5)(6)(7)(8)(9)(10)(11)(12). The majority of the original studies investigating setup error relied on the alignment of two-dimensional images such as megavoltage portal films to a reference digitally reconstructed radiograph, as opposed to a three-dimensional (3D) volumetric registration such as cone-beam computed tomography (CBCT) to a planning computed tomography (CT) scan.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cone-Beam CT Assessment of Interfraction and Intrafraction Setup Error of Two Head-and-Neck Cancer Thermoplastic Masks

Velec

Waldron

O’Sullivan

et al. 2010

International Journal of Radiation Oncology*Biology*Physics

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cone-Beam CT Assessment of Interfraction and Intrafraction Setup Error of Two Head-and-Neck Cancer Thermoplastic Masks

Velec

Waldron

O’Sullivan

et al. 2010

International Journal of Radiation Oncology*Biology*Physics

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“…In this paper we show that 3D printing of bespoke radiotherapy masks is feasible and warrants further investigation. [5]. In this paper the feasibility of using 3D printers to directly construct either a "positive" face or a treatment ("negative") shell from CT or MRI data is investigated.…”

Section: Introductionmentioning

confidence: 99%

Towards the production of radiotherapy treatment shells on 3D printers using data derived from DICOM CT and MRI: preclinical feasibility studies

et al. 2014

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Abstract:Immobilisation for patients undergoing brain or head and neck radiotherapy is achieved using perspex or thermoplastic devices that require direct moulding to patient anatomy. The mould room visit can be distressing for patients and the shells do not always fit perfectly. In addition the mould room process can be time consuming. With recent developments in 3D printing technologies comes the potential to generate a treatment shell directly from a computer model of a patient. Typically, a patient requiring radiotherapy treatment will have had a CT scan and if a computer model of a shell could be obtained directly from the CT data it would reduce patient distress, reduce visits, obtain a close fitting shell and possibly enable the patient to start their radiotherapy treatment more quickly. This paper focusses on the first stage of generating the front part of the shell and investigates the dosimetric properties of the materials to show the feasibility of 3D printer materials for the production of a radiotherapy treatment shell. The majority of the possible candidate 3D printing materials tested result in very similar attenuation of a therapeutic RT beam as the Orfit soft-drape masks currently in use in many UK radiotherapy centres. The costs involved Powered by Editorial Manager® and ProduXion Manager® from Aries Systems Corporationin 3d printing are reducing and the applications to medicine are becoming more widely adopted. In this paper we show that 3D printing of bespoke radiotherapy masks is feasible and warrants further investigation. Powered by Editorial Manager® and ProduXion Manager® from Aries Systems CorporationTowards the Production of Radiotherapy Treatment Shells on 3D printers using data derived from DICOM CT and MRI: preclinical feasibility studies. AbstractImmobilisation for patients undergoing brain or head and neck radiotherapy is achieved using perspex or thermoplastic devices that require direct moulding to patient anatomy. The mould room visit can be distressing for patients and the shells do not always fit perfectly. In addition the mould room process can be time consuming. With recent developments in 3D printing technologies comes the potential to generate a treatment shell directly from a computer model of a patient. Typically, a patient requiring radiotherapy treatment will have had a CT scan and if a computer model of a shell could be obtained directly from the CT data it would reduce patient distress, reduce visits, obtain a close fitting shell and possibly enable the patient to start their radiotherapy treatment more quickly. This paper focusses on the first stage of generating the front part of the shell and investigates the dosimetric properties of the materials to show the feasibility of 3D printer materials for the production of a radiotherapy treatment shell. The majority of the possible candidate 3D printing materials tested result in very similar attenuation of a therapeutic RT beam as the Orfit soft-drape masks currently in use in many UK radiotherapy centres. The costs ...

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“…Target immobilization is usually achieved using head immobilization masks, 5 , 12 often combined with patient‐specific neck cushions. We found that in spite of the use of immobilization masks, the many degrees of freedom, shape change and large (long) targets in the head and neck region, make immobilization within these 3–5 mm criteria for the entire target volume a significant challenge.…”

Section: Introductionmentioning

confidence: 99%

Clinical experience of the importance of daily portal imaging for head and neck IMRT treatments

Court

Wolfsberger

Allen

et al. 2008

J Applied Clin Med Phys

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The purpose of this study was to evaluate patient setup in head and neck IMRT using daily portal imaging. At our institution, orthogonal digital portal images are taken daily to check patient positioning prior to head and neck IMRT treatment. Isocenter misalignments are corrected using a couch shift (3 mm action level). Therapists also compare the DRRs and portal images looking at points more distant from the isocenter, particularly in the supraclavicular region, and re‐position the patient's shoulders in the mask if considered necessary. The daily isocenter shifts (C2 region) and frequency of patient repositioning were investigated by review of record‐and‐verify records for 15 patients. The magnitude of the shoulder repositioning was evaluated for 10 of these patients by comparing portal images and plan DRRs for a point 8 cm inferior of isocenter (T2‐T4).For all patients, pretreatment isocenter discrepancies 3 mm or smaller were recorded for a median of 92.5% of fractions (range: 71.4 – 100%). Patients were repositioned in the immobilization mask before treatment for a median of 14% of fractions (3–34%). Thirty percent of these were for shoulder shifts of 1 cm or larger. Twenty percent of patients needed shoulder shifts of 1 cm or more for more than 7/35 fractions, meaning that without setup based on daily imaging, parts of the CTV would have received less than 95% of the prescribed dose. In conclusion, with our current immobilization, isocenter positioning accuracy is excellent, while correct shoulder position is more variable, particularly for a small subset of patients. Frequent imaging of head and neck IMRT patients is essential to accurate delivery of therapy, with shoulder position an important factor.PACS number: 87.53.Oq

show abstract

Randomized trial on two types of thermoplastic masks for patient immobilization during radiation therapy for head-and-neck cancer

Cited by 65 publications

References 17 publications

Cone-Beam CT Assessment of Interfraction and Intrafraction Setup Error of Two Head-and-Neck Cancer Thermoplastic Masks

Cone-Beam CT Assessment of Interfraction and Intrafraction Setup Error of Two Head-and-Neck Cancer Thermoplastic Masks

Towards the production of radiotherapy treatment shells on 3D printers using data derived from DICOM CT and MRI: preclinical feasibility studies

Clinical experience of the importance of daily portal imaging for head and neck IMRT treatments

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