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Contouring radiotherapy

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https://www.readbyqxmd.com/read/28727787/feasibility-of-a-3d-printed-anthropomorphic-patient-specific-head-phantom-for-patient-specific-quality-assurance-of-intensity-modulated-radiotherapy
#1
Ji Woon Yea, Jae Won Park, Sung Kyu Kim, Dong Youn Kim, Jae Gu Kim, Chan Young Seo, Won Hyo Jeong, Man Youl Jeong, Se An Oh
This study evaluated the feasibility of utilizing a 3D-printed anthropomorphic patient-specific head phantom for patient-specific quality assurance (QA) in intensity-modulated radiotherapy (IMRT). Contoured left and right head phantoms were converted from DICOM to STL format. Fused deposition modeling (FDM) was used to construct an anthropomorphic patient-specific head phantom with a 3D printer. An established QA technique and the patient-specific head phantom were used to compare the calculated and measured doses...
2017: PloS One
https://www.readbyqxmd.com/read/28716090/clinical-workflow-for-mr-only-simulation-and-planning-in-prostate
#2
Neelam Tyagi, Sandra Fontenla, Michael Zelefsky, Marcia Chong-Ton, Kyle Ostergren, Niral Shah, Lizette Warner, Mo Kadbi, Jim Mechalakos, Margie Hunt
PURPOSE: To describe the details and experience of implementing a MR-only workflow in the clinic for simulation and planning of prostate cancer patients. METHODS: Forty-eight prostate cancer patients from June 2016 - Dec 2016 receiving external beam radiotherapy were scheduled to undergo MR-only simulation. MR images were acquired for contouring (T2w axial, coronal, sagittal), synthetic-CT generation (3D FFE-based) and fiducial identification (3D bFFE-based). The total acquisition time was 25 min...
July 17, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28714458/a-graphical-approach-to-optimizing-variable-kernel-smoothing-parameters-for-improved-deformable-registration-of-ct-and-cone-beam-ct-images
#3
Vern Hart, Damon Burrow, X Allen Li
A systematic method is presented for determining optimal parameters in variable-kernel deformable image registration of cone beam CT and CT images, in order to improve accuracy and convergence for potential use in online adaptive radiotherapy. Assessed conditions included the noise constant (symmetric force demons), the kernel reduction rate, the kernel reduction percentage, and the kernel adjustment criteria. Four such parameters were tested in conjunction with reductions of 5, 10, 15, 20, 30, and 40%. Noise constants ranged from 1...
July 17, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28709427/investigation-of-irradiated-volume-in-linac-based-brain-hypo-fractionated-stereotactic-radiotherapy
#4
Mark Ruschin, Arjun Sahgal, Hany Soliman, Sten Myrehaug, May Tsao, Collins Yeboah, Arman Sarfehnia, Brige Chugh, Alex Kiss, Young Lee
BACKGROUND: Emerging techniques such as brain hypo-fractionated radiotherapy (HF-RT) involve complex cases with limited guidelines for plan quality and normal tissue tolerances. The purpose of the present study was to statistically parameterize irradiated volume independently of dose prescription, or margin to determine what spread in achievable irradiated volume one may expect for a given case. METHODS: We defined EXT as the total tissue within the external contour of the patient (including the target) and we defined BMP as the contour of the brain minus PTV...
July 14, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28674678/tangential-field-radiotherapy-for-breast-cancer-the-dose-to-the-heart-and-heart-subvolumes-what-structures-must-be-contoured-in-future-clinical-trials
#5
Marciana Nona Duma, Anne-Claire Herr, Kai Joachim Borm, Klaus Rüdiger Trott, Michael Molls, Markus Oechsner, Stephanie Elisabeth Combs
BACKGROUND AND PURPOSE: The aim of the present study was to evaluate if it is feasible for experienced radiation oncologists to visually sort out patients with a large dose to the heart. This would facilitate large retrospective data evaluations. And in case of an insufficient visual assessment, to define which structures should be contoured and which structures can be skipped as their dose can be derived from other easily contoured structures for future clinical trials. MATERIAL AND METHODS: Planning CTs of left-sided breast cancer patients treated with 3D-conformal radiotherapy by tangential fields were visually divided into two groups: with an estimated high dose (HiD) and with an estimated low dose (LoD) to the heart...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28661100/estimation-of-lung-tumor-position-from-multiple-anatomical-features-on-4d-ct-using-multiple-regression-analysis
#6
Tomohiro Ono, Mitsuhiro Nakamura, Yoshinori Hirose, Kenji Kitsuda, Yuka Ono, Takashi Ishigaki, Masahiro Hiraoka
To estimate the lung tumor position from multiple anatomical features on four-dimensional computed tomography (4D-CT) data sets using single regression analysis (SRA) and multiple regression analysis (MRA) approach and evaluate an impact of the approach on internal target volume (ITV) for stereotactic body radiotherapy (SBRT) of the lung. Eleven consecutive lung cancer patients (12 cases) underwent 4D-CT scanning. The three-dimensional (3D) lung tumor motion exceeded 5 mm. The 3D tumor position and anatomical features, including lung volume, diaphragm, abdominal wall, and chest wall positions, were measured on 4D-CT images...
June 29, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28660217/a-prospective-study-comparing-functional-imaging-18-f-fdg-pet-versus-anatomical-imaging-contrast-enhanced-ct-in-dosimetric-planning-for-non-small-cell-lung-cancer
#7
Archana Prathipati, Ranadheer Gupta Manthri, Bala Venkat Subramanian, Pranabandhu Das, Swapna Jilla, Sangeetha Mani, Anitha Kumari J, Settipalli Sarala, Radhika Kottu, Tek Chand Kalawat, Kotiyala Venkata Jagannath Rao Naidu
OBJECTIVES: (18)F-fluorodeoxyglucose positron emission tomography/computed tomography ((18)F-FDG PET-CT) is a well-used and established technique for lung cancer staging. Radiation therapy requires accurate target volume delineation, which is difficult in most cases due to coexisting atelectasis. The present study was performed to compare the (18)F-FDG PET-CT with contrast enhanced computed tomography (CECT) in target volume delineation and investigate their impacts on radiotherapy planning...
2017: Asia Oceania Journal of Nuclear Medicine & Biology
https://www.readbyqxmd.com/read/28646463/patterns-of-failure-after-radical-prostatectomy-in-prostate-cancer-implications-for-radiation-therapy-planning-after-68-ga-psma-pet-imaging
#8
Kilian Schiller, K Sauter, S Dewes, M Eiber, T Maurer, J Gschwend, S E Combs, G Habl
BACKGROUND: Salvage radiotherapy (SRT) after radical prostatectomy (RPE) and lymphadenectomy (LAE) is the appropriate radiotherapy option for patients with persistent/ recurrent prostate cancer (PC). (68)Ga-PSMA-PET imaging has been shown to accurately detect PC lesions in a primary setting as well as for local recurrence or for lymph node (LN) metastases. OBJECTIVE: In this study we evaluated the patterns of recurrence after RPE in patients with PC, putting a highlight on the differentiation between sites that would have been covered by a standard radiation therapy (RT) field in consensus after the RTOG consensus and others that would have not...
June 23, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28633674/primary-tumor-volume-delineation-in-head-and-neck-cancer-missing-the-tip-of-the-iceberg
#9
Olgun Elicin, Dario Terribilini, Mohamed Shelan, Werner Volken, Etienne Mathier, Alan Dal Pra, Daniel M Aebersold, Michael K Fix, Peter Manser
BACKGROUND: The aim was to evaluate the geometric and corresponding dosimetric differences between two delineation strategies for head and neck tumors neighboring air cavities. METHODS: Primary gross and clinical tumor volumes (GTV and CTV) of 14 patients with oropharynx or larynx tumors were contoured using a soft tissue window (S). In a second strategy, the same volumes were contoured with an extension to include the parts which became visible on lung window (L)...
June 20, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28626489/conference-report-on-the-indo-global-summit-on-head-and-neck-oncology-igshno-2017-bmcon-iv-24-26-february-2017-jaipur-india
#10
Tej Prakash Soni, Anil K Gupta, Lalit M Sharma, Pawan Singhal, Dinesh Yadav, Umesh Bansal
'The multidisciplinary approach: expanding treatment horizons for head and neck cancer' was the major theme of the Indo Global Summit on Head and Neck Oncology (IGSHNO 2017-BMCON-IV). The meeting, held in Jaipur (Rajasthan, India) from 24 to 26 February 2017, assembled 600 participants from India and worldwide. It was organised by the Bhagwan Mahaveer Cancer Hospital and Research Centre (BMCHRC), Jaipur. BMCHRC Jaipur is one of the largest superspeciality oncology research and treatment centres in north India...
2017: Ecancermedicalscience
https://www.readbyqxmd.com/read/28624714/patient-reported-outcomes-of-autologous-fat-grafting-after-breast-cancer-surgery
#11
A W W Brown, M Kabir, K A Sherman, F Meybodi, J R French, E B Elder
INTRODUCTION: Autologous fat grafting (AFG) can be used as an adjunct in breast cancer surgery to improve contour defects. Few previous studies have assessed patient reported outcomes (PROs) for AFG. This study analysed AFG use and assessed PROs in terms of physical and psychosocial well-being. MATERIALS AND METHODS: All patients undergoing AFG were identified from a prospective database and asked to complete the validated BREAST-Q questionnaire and a tool to assess patient-perceived change after AFG (5-point Likert-type scale)...
June 15, 2017: Breast: Official Journal of the European Society of Mastology
https://www.readbyqxmd.com/read/28623847/toxicity-after-post-prostatectomy-image-guided-intensity-modulated-radiotherapy-using-australian-guidelines
#12
Stephen Chin, Noel J Aherne, Andrew Last, Hassan Assareh, Thomas P Shakespeare
INTRODUCTION: We evaluated single institution toxicity outcomes after post-prostatectomy radiotherapy (PPRT) via image-guided intensity-modulated radiation therapy (IG-IMRT) with implanted fiducial markers following national eviQ guidelines, for which late toxicity outcomes have not been published. METHODS: Prospectively collected toxicity data were retrospectively reviewed for 293 men who underwent 64-66 Gy IG-IMRT to the prostate bed between 2007 and 2015. RESULTS: Median follow-up after PPRT was 39 months...
June 17, 2017: Journal of Medical Imaging and Radiation Oncology
https://www.readbyqxmd.com/read/28620579/delineation-of-the-prostate-bed-the-invisible-target-is-still-an-issue
#13
Igor Latorzeff, Paul Sargos, Geneviève Loos, Stéphane Supiot, Stéphane Guerif, Christian Carrie
For pathological high-risk prostate cancer, adjuvant irradiation has shown a survival benefit. Phase III studies have highlighted that half men would face biochemical relapse and would be candidate for radiotherapy at adjuvant or salvage times. Despite at least four published international contouring guidelines from different collaborative groups, discrepancies remain for volumes, delineation, and margins to be considered in order to optimize radiotherapy planning. This article from "Groupe d'Etude des Tumeurs UroGénitales (GETUG)" members will focus on controversies to help clinicians to create best volume delineation for adjuvant or salvage post prostatectomy radiotherapy...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28611300/consistency-mapping-of-16-lymph-node-stations-in-gastric-cancer-by-ct-based-vessel-guided-delineation-of-255-patients
#14
Shuhang Xu, Lingling Feng, Yongming Chen, Ying Sun, Yao Lu, Shaomin Huang, Yang Fu, Rongqin Zheng, Yujing Zhang, Rong Zhang
In order to refine the location and metastasis-risk density of 16 lymph node stations of gastric cancer for neoadjuvant radiotherapy, we retrospectively reviewed the initial images and pathological reports of 255 gastric cancer patients with lymphatic metastasis. Metastatic lymph nodes identified in the initial computed tomography images were investigated by two radiologists with gastrointestinal specialty. A circle with a diameter of 5 mm was used to identify the central position of each metastatic lymph node, defined as the LNc (the central position of the lymph node)...
June 20, 2017: Oncotarget
https://www.readbyqxmd.com/read/28603707/maxillary-resection-for-cancer-zygomatic-implants-insertion-and-palatal-repair-as-single-stage-procedure-report-of-three-cases
#15
Pietro Salvatori, Antonio Mincione, Lucio Rizzi, Fabrizio Costantini, Alessandro Bianchi, Emma Grecchi, Umberto Garagiola, Francesco Grecchi
BACKGROUND: Oronasal/antral communication, loss of teeth and/or tooth-supporting bone, and facial contour deformity may occur as a consequence of maxillectomy for cancer. As a result, speaking, chewing, swallowing, and appearance are variably affected. The restoration is focused on rebuilding the oronasal wall, using either flaps (local or free) for primary closure, either prosthetic obturator. Postoperative radiotherapy surely postpones every dental procedure aimed to set fixed devices, often makes it difficult and risky, even unfeasible...
December 2017: Maxillofacial Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28600083/evaluation-of-clinical-target-volume-expansion-required-for-involved-site-neck-radiotherapy-for-lymphoma-to-account-for-the-absence-of-a-pre-chemotherapy-pet-ct-in-the-radiotherapy-treatment-position
#16
David Bird, Chirag Patel, Andrew F Scarsbrook, Viv Cosgrove, Emma Thomas, Di Gilson, Robin J D Prestwich
BACKGROUND AND PURPOSE: Involved site radiotherapy clinical target volume (CTV) for lymphoma requires an expansion to account for the absence of radiotherapy treatment-position pre-chemotherapy imaging, which is not widely implemented. This prospective imaging study aims to quantify CTV expansion required for neck radiotherapy. MATERIALS AND METHODS: 10 patients from a prospective single centre imaging study underwent a pre-chemotherapy FDG-PET-CT in both the diagnostic and radiotherapy treatment position, and subsequently received neck radiotherapy post-chemotherapy...
June 6, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28594079/development-of-the-breast-immobilization-system-in-prone-setup-the-effect-of-bra-in-prone-position-to-improve-the-breast-setup-error
#17
Mariko Kawamura, Yoshikazu Maeda, Kazutaka Yamamoto, Shigeyuki Takamatsu, Yoshitaka Sato, Hiroki Minami, Yusuke Saga, Kyo Kume, Yuji Tameshige, Makoto Sasaki, Hiroyasu Tamamura, Kouji Ohta, Yoshiyuki Itoh, Shinji Naganawa
PURPOSE/OBJECTIVE(S): Accurate and reproducible positioning of the breast is difficult due to its deformability and softness; thus, targeting a breast tumor or tumor bed with fractionated radiotherapy using external beam radiation is difficult. The aim of this study was to develop a novel bra to aid in breast immobilization in the prone position. MATERIALS & METHODS: To assess the accuracy of prone position fixation of breast tumors, 33 breast cancer patients with 34 lesions were recruited...
June 8, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28585715/does-liver-resection-transplantation-affect-respiratory-induced-liver-motion-in-patients-with-hepatocellular-carcinoma
#18
Yong Hu, Yong-Kang Zhou, Yi-Xing Chen, Lu-Xi Ye, Zhao-Chong Zeng
The purpose of this study was to evaluate the changes in magnitude of three-dimensional (3D) liver motion after liver resection/transplantation in patients with hepatocellular carcinoma (HCC) using four-dimensional (4D)-computed tomography (CT) images. From January 2012 to April 2016, 74 HCC patients underwent 4D-CT scans under a free-breathing state to assess respiratory liver motion. Of the 74 patients, 40 did not have a liver resection/transplantation (Group A), 34 with liver resection/transplantation. 15 underwent major or minor resection in the right liver lobe (Group B), 14 underwent major or minor resection in the left liver lobe (Group C), and five underwent liver transplantation (Group D)...
June 6, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28573978/automatic-contour-propagation-using-deformable-image-registration-to-determine-delivered-dose-to-spinal-cord-in-head-and-neck-cancer-radiotherapy
#19
Ping Lin Yeap, David Noble, Karl Harrison, Amy Bates, Neil Burnet, Rajesh Jena, Marina Romanchikova, Michael Sutcliffe, Simon Thomas, Gill Barnett, Richard Benson, Sarah Jefferies, M Parker
To determine delivered dose to the spinal cord, a technique has been developed to propagate manual contours from kilovoltage computed-tomography (kVCT) scans for treatment planning to megavoltage computed-tomography (MVCT) guidance scans. The technique uses the Elastix software to perform intensity-based deformable image registration of each kVCT scan to the associated MVCT scans. The registration transform is then applied to contours of the spinal cord drawn manually on the kVCT scan, to obtain contour positions on the MVCT scans...
June 2, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28557799/repeatability-of-dose-painting-by-numbers-treatment-planning-in-prostate-cancer-radiotherapy-based-on-multiparametric-magnetic-resonance-imaging
#20
Marcel A van Schie, Peter Steenbergen, Cuong Viet Dinh, Ghazaleh Ghobadi, Petra van Houdt, Floris Pos, Stijn Heijmink, Henk van der Poel, Steffen Renisch, Torbjoern Vik, Uulke van der Heide
Dose painting by numbers (DPBN) refers to a voxel-wise prescription of radiation dose modelled from functional image characteristics, in contrast to dose painting by contours which requires delineations to define the target for dose escalation. The direct relation between functional imaging characteristics and DPBN implies that random variations in images may propagate into the dose distribution. The stability of MR-only prostate cancer treatment planning based on DPBN with respect to these variations is as yet unknown...
May 30, 2017: Physics in Medicine and Biology
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