Devices valuable in head and neck radiotherapy

Kaanders, Johannes H.A.M.; Fleming, Terence J.; Ang, K. Kian; Maor, Moshe; Peters, Lester J.

doi:10.1016/0360-3016(92)90023-b

Cited by 55 publications

(38 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…First, DxCT acquisition routinely is performed on a curved tabletop without standardized head positioning, while the SimCT is obtained in a custom thermoplastic immobilization mask on a flat toped table, resulting in positional differences of head and neck tissues (15, 16). In several head and neck cancers, institutional use of a intraoral immobilization and displacement device, such as a custom dental stent (19), results in placement of a new structure in the SimCT which was not present in the DxCT. Additionally, DxCT typically entails use of intravenous contrast for tumor assessment, while at our facility and many others, intravenous contrast is not utilized for SimCT, resulting in intensity differentials for the same structures (10).…”

Section: Introductionmentioning

confidence: 99%

Quality Assurance Assessment of Diagnostic and Radiation Therapy–Simulation CT Image Registration for Head and Neck Radiation Therapy: Anatomic Region of Interest–based Comparison of Rigid and Deformable Algorithms

Mohamed¹,

Ruangskul²,

Awan³

et al. 2015

Radiology

View full text Add to dashboard Cite

Purpose To develop a quality assurance (QA) workflow using a robust, curated, manually-segmented anatomic ROI library as a benchmark for quantitative assessment of different image registration techniques used for head and neck radiation therapy-simulation CT (SimCT) to diagnostic CT (DxCT) co-registration. Materials and Methods SimCTs and DxCTs of twenty patients with head and neck squamous cell carcinoma treated with curative-intent intensity modulated radiotherapy (IMRT) between August 2011 and May 2012 were retrospectively retrieved under an institutional review board approval. 68 reference anatomic regions of interest (ROIs) in addition to gross tumor and nodal targets were then manually contoured on each scan. DxCT was registered to SimCT rigidly, and through 4 different deformable image registration (DIR) algorithms; Atlas-based, B-spline, demons, and optical flow. The resultant deformed ROIs were compared with manually contoured reference ROIs using similarity coefficient metrics (i.e. Dice similarity coefficient) and surface distance metrics (i.e. 95% maximum Hausdorff distance). Non-parametric Steel test with control was used to compare different DIR algorithms to rigid registration (RIR) with post hoc Wilcoxon rank test for stratified metric comparison. Results A total of 2720 anatomic and 50 tumor/nodal ROIs were delineated. All DIR algorithms showed improved performance over RIR for both anatomic and target ROIs conformance as shown for the majority of comparison metrics (Steel test, p-value <0.008 after Bonferroni correction). The performance of different algorithms varied substantially with stratification by specific anatomic structures/category, and SimCT image slice thickness. Conclusion Development of a formal ROI-based QA workflow for registration assessment revealed improved performance with DIR techniques over RIR. After QA, DIR implementation should be the standard for head and neck DxCT-SimCT allineation, especially for target delineation.

show abstract

Section: Introductionmentioning

confidence: 99%

Quality Assurance Assessment of Diagnostic and Radiation Therapy–Simulation CT Image Registration for Head and Neck Radiation Therapy: Anatomic Region of Interest–based Comparison of Rigid and Deformable Algorithms

Mohamed¹,

Ruangskul²,

Awan³

et al. 2015

Radiology

View full text Add to dashboard Cite

show abstract

“…7 Xerostomia may be caused by radiation therapy and drugs, severing of salivary duct and gland (accidental or intentional), decreased liquid intake or stress and anxiety. Measures taken to reduce the severity of xerostomia are: 5,13 • Radiation stents 14 can be fabricated to shield the ipsilateral side when unilateral radiation treatment is required. Another method of limiting radiation to salivary gland is conformal and intensity-modulated irradiation technique (IMRT).…”

Section: Xerostomiamentioning

confidence: 99%

Oral Complications and Its Management during Radiotherapy

Kumar¹,

Rastogi²

2011

International Journal of Head and Neck Surgery

View full text Add to dashboard Cite

Cancer is a class of diseases in which a cell or a group of cells display uncontrolled growth, invasion, and sometimes metastasis. The term head and neck cancer refers to a group of biologically similar cancers originating from the upper aerodigestive tract, including the lip, oral cavity, nasal cavity, paranasal sinuses, pharynx and larynx. About 90% of head and neck cancers are squamous cell carcinomas, originating from the mucosal lining (epithelium) of these regions. Radiation therapy is the most common form of treatment along with surgery and chemotherapy. There are different forms of radiation therapy, including 3D conformal radiation therapy, intensity-modulated radiation therapy and brachytherapy, which are commonly used in the treatment of cancers of the head and neck. There are both acute and long-term sequelae of radiation therapy (RT) for head and neck cancer (HNC) that occur because of effects on normal tissues. Radiotherapy-induced oral complications are complex, dynamic pathobiological processes that lower the quality of life and predispose patients to serious clinical disorders. Radiotherapy-induced damage in the oral mucosa is the result of the deleterious effects of radiation, not only on the oral mucosa itself but also on the adjacent salivary glands, bone, dentition, and masticatory musculature and apparatus.Dental surgeons should organize and implement preventive and therapeutic strategies in the management of various complications due to radiotherapy. The clinical features, diagnosis and management of various complications are discussed here. This article mainly presents a brief overview of the whole program of oral evaluation and proper care before, during and after the radiotherapy, managing all the common problems involved.

show abstract

“…Peranti yang terbaik mestilah diperbuat daripada bahan yang kukuh, mudah diperoleh di pasaran, murah, dan yang paling penting ialah mampu memastikan struktur yang dicegah gerak tidak bergerak dan berada dalam posisi yang sama sepanjang sesi rawatan. Bagi kes kanser oral, peranti bukan sahaja digunakan untuk cegah gerak lidah tetapi ada juga yang menciptanya untuk melindung tisu berhampiran daripada terkena sinaran (Kaanders et al 1992). Sinaran terkena pada lantai mulut atau lipatan sublingual kerana mobiliti struktur yang terlibat akan memberi kesan kepada maksila dan meningkatkan risiko osteoradionekrosis.…”

Section: Pendahuluanunclassified

Interfraction Treatment Setup Accuracy with Different Immobilisation Devices in VMAT for Oral Cancer Patients

Nor

Ahmad

Ping

2017

JSKM

View full text Add to dashboard Cite

Kejituan persediaan rawatan dengan teknik yang kesamabentukannya tinggi seperti terapi isi padu arka termodulat (VMAT) berupaya mengurangkan dedahan dos sinaran yang berlebihan di bahagian mukosa oral. Oleh itu, satu kajian telah dijalankan untuk meningkatkan kejituan persediaan rawatan antara-pecahan rawatan dengan mengenal pasti penggunaan peranti cegah gerak yang sesuai. Seramai dua belas pesakit kanser mulut terlibat dalam kajian ini. Mereka dikategorikan kepada tiga kumpulan yang menggunakan peranti cegah gerak yang berbeza; HFW: headFIX ® mouthpiece dibentuk dengan lilin, SYR: 10 cc / ml picagari dan TDW: lilin dibentuk pada kayu penekan lidah. Sebelum rawatan diberikan, pesakit menjalani radioterapi berpandukan imej (IGRT) bagi pengukuran ralat persediaan rawatan posisi. Sejumlah 292 set imej tomografi berkomputer bim-kon (CBCT) diperolehi. Perbezaan pada translasi (lateral, longitudinal, vertikal) dan rotasi (pic, guling, rewang) dalam setiap imej CBCT ditentukan. Ralat posisi pesakit dianalisis untuk aliran masa sepanjang radioterapi. Pengiraan ralat sistematik (Σ) dan rawak (σ) dilakukan dan margin CTV-PTV ditentukan. Min ± SD bagi ralat persediaan rawatan mutlak untuk HFW adalah paling rendah (p < 0.001) untuk semua ralat translasi

show abstract

Devices valuable in head and neck radiotherapy

Cited by 55 publications

References 4 publications

Quality Assurance Assessment of Diagnostic and Radiation Therapy–Simulation CT Image Registration for Head and Neck Radiation Therapy: Anatomic Region of Interest–based Comparison of Rigid and Deformable Algorithms

Quality Assurance Assessment of Diagnostic and Radiation Therapy–Simulation CT Image Registration for Head and Neck Radiation Therapy: Anatomic Region of Interest–based Comparison of Rigid and Deformable Algorithms

Oral Complications and Its Management during Radiotherapy

Interfraction Treatment Setup Accuracy with Different Immobilisation Devices in VMAT for Oral Cancer Patients

Contact Info

Product

Resources

About