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Contouring radiotherapy

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https://www.readbyqxmd.com/read/28633674/primary-tumor-volume-delineation-in-head-and-neck-cancer-missing-the-tip-of-the-iceberg
#1
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
#2
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
#3
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
#4
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
#5
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
#6
Shuhang Xu, Lingling Feng, Yongming Chen, Ying Sun, Yao Lu, Shaomin Huang, Yang Fu, Zhi-Yu Han, 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 8, 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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
https://www.readbyqxmd.com/read/28553585/dosimetric-and-radiobiological-evaluation-of-multiparametric-mri-guided-dose-painting-in-radiotherapy-of-prostate-cancer
#13
Iraj Abedi, Mohammad B Tavakkoli, Keyvan Jabbari, Alireza Amouheidari, Ghasem Yadegarfard
Radiotherapy is one of the treatment options for locally advanced prostate cancer; however, with standard radiation doses, it is not always very effective. One of the strategies to improve the efficiency of radiotherapy is increasing the dose. In this study, to increase tumor local control rates, a new radiotherapy method, known as dose painting (DP), was investigated. To compare 3-dimensional conformal radiotherapy (3D-CRT) and intensity modulated radiotherapy (IMRT) plans with DP for prostate cancer. Twenty-four consecutive patients with locally advanced prostate cancer who underwent an multiparametric-magnetic resonance imaging (MP-MRI) (T2w, diffusion weighted image, dynamic contrast enhancement, and MRS) scan before a diagnostic biopsy from September 2015 to April 2016 were invited to take part in this study...
April 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28543069/real-time-dynamic-mr-image-reconstruction-using-compressed-sensing-and-principal-component-analysis-cs-pca-demonstration-in-lung-tumor-tracking
#14
Bryson Dietz, Eugene Yip, Jihyun Yun, B Gino Fallone, Keith Wachowicz
PURPOSE: This work presents a real-time dynamic image reconstruction technique, that combines compressed sensing and principal component analysis (CS-PCA), to achieve real-time adaptive radiotherapy with the use of a linac-magnetic resonance imaging system. METHODS: Six retrospective fully sampled dynamic data sets of patients diagnosed with non-small cell lung cancer were used to investigate the CS-PCA algorithm. Using a database of fully sampled k-space, principal components (PC's) were calculated to aid in the reconstruction of undersampled images...
May 19, 2017: Medical Physics
https://www.readbyqxmd.com/read/28534430/variability-in-axillary-lymph-node-delineation-for-breast-cancer-radiotherapy-in-presence-of-guidelines-on-a-multi-institutional-platform
#15
Delia Ciardo, Angela Argenone, Genoveva Ionela Boboc, Francesca Cucciarelli, Fiorenza De Rose, Maria Carmen De Santis, Alessandra Huscher, Edy Ippolito, Maria Rosa La Porta, Lorenza Marino, Ilaria Meaglia, Isabella Palumbo, Francesca Rossi, Paolo Alpi, Mario Bignardi, Alessio Bonanni, Domenico Cante, Tino Ceschia, Letizia Fabbietti, Marco Lupattelli, Elisa Donatella Mantero, Alessia Monaco, Patrizia Porcu, Vincenzo Ravo, Sonia Silipigni, Angelo Tozzi, Vincenza Umina, Dario Zerini, Luigi Bordonaro, Giorgia Capezzali, Elena Clerici, Sarah Pia Colangione, Michela Dispinzieri, Jessica Dognini, Laura Donadoni, Sara Falivene, Alessandra Fozza, Barbara Grilli, Roberta Guarnaccia, Eva Iannacone, Valentina Lancellotta, Agnese Prisco, Rosalinda Ricotti, Roberto Orecchia, Barbara Alicja Jereczek-Fossa, Maria Cristina Leonardi
AIM: To quantify the variability between radiation oncologists (ROs) when outlining axillary nodes in breast cancer. MATERIAL AND METHODS: For each participating center, three ROs with different levels of expertise, i.e., junior (J), senior (S) and expert (E), contoured axillary nodal levels (L1, L2, L3 and L4) on the CT images of three different patients (P) of an increasing degree of anatomical complexity (from P1 to P2 to P3), according to contouring guidelines...
August 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28533050/dual-core-steered-non-rigid-registration-for-multi-modal-images-via-bi-directional-image-synthesis
#16
Xiaohuan Cao, Jianhua Yang, Yaozong Gao, Yanrong Guo, Guorong Wu, Dinggang Shen
In prostate cancer radiotherapy, computed tomography (CT) is widely used for dose planning purposes. However, because CT has low soft tissue contrast, it makes manual contouring difficult for major pelvic organs. In contrast, magnetic resonance imaging (MRI) provides high soft tissue contrast, which makes it ideal for accurate manual contouring. Therefore, the contouring accuracy on CT can be significantly improved if the contours in MRI can be mapped to CT domain by registering MRI with CT of the same subject, which would eventually lead to high treatment efficacy...
May 13, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28532608/assessment-of-the-novel-online-delineation-workshop-dummy-run-approach-using-falcon-within-a-european-multicentre-trial-in-cervical-cancer-raids
#17
Eleonor Rivin Del Campo, Sofia Rivera, María Martínez-Paredes, Philippe Hupé, Andrea Slocker Escarpa, Isabelle Borget, Renaud Mazeron, Suzy Scholl, Amalia Palacios Eito, Christine Haie-Meder, Cyrus Chargari, Eric Deutsch
BACKGROUND AND PURPOSE: Online delineation workshops (ODW) permit training of geographically dispersed participants. The purpose is to evaluate the methodology of an ODW using FALCON to harmonize delineation within a European multicentre trial on locally advanced cervical cancer (LACC). MATERIAL AND METHODS: Two ODW included 46 clinicians (14 centres). Clinicians completed baseline (C1), guideline (C2) and final contours (C3) for external beam radiotherapy (EBRT) and brachytherapy (BT) for LACC...
May 19, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28510808/development-of-a-contouring-guide-in-three-different-head-set-ups-for-hippocampal-sparing-radiotherapy-a-practical-approach
#18
Saide Di Biase, Marianna Trignani, Luciana Caravatta, Paul Ioan Voicu, Clelia Di Carlo, Annamaria Vinciguerra, Antonietta Augurio, Francesca Perrotti, Valentina Panara, Domenico Genovesi
BACKGROUNDS: Irradiation of the hippocampus plays a role in neurocognitive toxicity. Its delineation is complex and in practice different head position can vary hippocampus morphology on axial images; so atlas in a single standard position can result ineffective to describe different hippocampal morphologies in different head set-up. The purpose of our study was to develop a guide based on magnetic resonance imaging for hippocampus delineation in three different head set-ups. MATERIALS AND METHODS: Three patients were selected to elaborate our guide...
May 16, 2017: La Radiologia Medica
https://www.readbyqxmd.com/read/28493295/towards-ultrasound-guided-adaptive-radiotherapy-for-cervical-cancer-evaluation-of-elekta-s-semi-automated-uterine-segmentation-method-on-3d-ultrasound-images
#19
Sarah A Mason, Tuathan P O'Shea, Ingrid M White, Susan Lalondrelle, Kate Downey, Mariwan Baker, Claus F Behrens, Jeffrey C Bamber, Emma J Harris
PURPOSE: 3D ultrasound (US) images of the uterus may be used to adapt radiotherapy (RT) for cervical cancer patients based on changes in daily anatomy. This requires accurate on-line segmentation of the uterus. The aim of this work was to assess the accuracy of Elekta's "Assisted Gyne Segmentation" (AGS) algorithm in semi-automatically segmenting the uterus on 3D transabdominal ultrasound images by comparison with manual contours. MATERIALS & METHODS: Nine patients receiving RT for cervical cancer were imaged with the 3D Clarity(®) transabdominal probe at RT planning, and 1 to 7 times during treatment...
May 10, 2017: Medical Physics
https://www.readbyqxmd.com/read/28480870/regional-deep-hyperthermia-impact-of-observer-variability-in-ct-based-manual-tissue-segmentation-on-simulated-temperature-distribution
#20
Bassim Aklan, Josefin Hartmann, Diana Zink, Hadi Siavooshhaghighi, Ricarda Merten, Florian Putz, Oliver Ott, Rainer Fietkau, Christoph Bert
The aim of this study was to systematically investigate the influence of the inter- and intra-observer segmentation variation of tumors and organs at risk on the simulated temperature coverage of the target. CT scans of six patients with tumors in the pelvic region acquired for radiotherapy treatment planning were used for hyperthermia treatment planning. To study the effect of inter-observer variation, three observers manually segmented in the CT images of each patient the following structures: fat, muscle, bone and the bladder...
May 8, 2017: Physics in Medicine and Biology
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