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tumor volume delineation

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https://www.readbyqxmd.com/read/27929505/a-comprehensive-evaluation-of-adaptive-daily-planning-for-cervical-cancer-hdr-brachytherapy
#1
Rebecca Meerschaert, Adrian Nalichowski, Jay Burmeister, Arun Paul, Steven Miller, Zhenghui Hu, Ling Zhuang
The purpose of this study was to evaluate adaptive daily planning for cervi-cal cancer patients who underwent high-dose-rate intracavitary brachytherapy (HDR-BT) using comprehensive interfractional organ motion measurements. This study included 22 cervical cancer patients who underwent 5 fractions of HDR-BT. Regions of interest (ROIs) including high-risk clinical tumor volume (HR-CTV) and organs at risk (OARs) were manually contoured on daily CT images. All patients were clinically treated with adaptive daily plans (ADP), which involved ROI delineation and dose optimization at each treatment fraction...
November 8, 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/27911139/volumetric-response-of-intracranial-meningioma-after-photon-or-particle-irradiation
#2
Petra Mozes, Jan Oliver Dittmar, Daniel Habermehl, Eric Tonndorf-Martini, Katalin Hideghety, Anne Dittmar, Jürgen Debus, Stephanie E Combs
BACKGROUND: Meningiomas are usually slow growing, well circumscribed intracranial tumors. In symptom-free cases observation with close follow-up imaging could be performed. Symptomatic meningiomas could be surgically removed and/or treated with radiotherapy. The study aimed to evaluate the volumetric response of intracranial meningiomas at different time points after photon, proton, and a mixed photon and carbon ion boost irradiation. PATIENTS AND METHODS: In Group A 38 patients received proton therapy (median dose: 56 GyE in 1...
December 2, 2016: Acta Oncologica
https://www.readbyqxmd.com/read/27904872/background-based-delineation-of-internal-tumor-volume-in-static-positron-emission-tomography-in-a-phantom-study
#3
Yangchun Chen, Xiangrong Chen, Ji-An Liu, Fanyong Li
OBJECTIVES: Considering the fact that the standardized uptake value (SUV) of a normal lung tissue is expressed as x±SD, x+3×SD could be considered as the threshold value to outline the internal tumor volume (ITV) of a lung neoplasm. METHODS: Three hollow models were filled with 55.0 kBq/mL fluorine-18 fluorodeoxyglucose ((18)F-FDG) to represent tumors. The models were fixed to a barrel filled with 5.9 kBq/mL (18)F-FDG to characterize normal lung tissues as a phantom...
2016: Asia Oceania Journal of Nuclear Medicine & Biology
https://www.readbyqxmd.com/read/27903466/preoperative-3-dimensional-magnetic-resonance-imaging-of-uterine-myoma-and-endometrium-prior-to-myomectomy
#4
Young Jae Kim, Kwang Gi Kim, Seung Hyun Lee, Byung Chul Kang, Sa Ra Lee
Uterine myomas are the most common gynecologic benign tumor affecting women of childbearing age, and myomectomy is the main surgical option to preserve the uterus and fertility. During myomectomy for women with multiple myomas, it is advisable to identify and remove as many as possible to decrease the risk of future myomectomies. With deficient preoperative imaging, gynecologists are challenged to identify the location and size of myomas and the endometrium, which in turn can lead to uterine rupture during future pregnancies...
November 26, 2016: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/27900019/the-relationship-between-tumor-volume-changes-and-serial-plasma-osteopontin-detection-during-radical-radiotherapy-of-non-small-cell-lung-cancer
#5
Christian Ostheimer, Franziska Schweyer, Thomas Reese, Matthias Bache, Dirk Vordermark
The prognostic quality of increased osteopontin (OPN) plasma levels has been demonstrated for the chemotherapy and surgery of lung cancer. There is also evidence in the literature that tumor volume impacts prognosis in definitive radiotherapy (RT) of (lung) cancer. We previously demonstrated that elevated plasma levels of OPN before, and increasing OPN plasma levels after RT significantly correlate with survival and outcome after curative-intent RT of non-small-cell lung cancer (NSCLC). Tumor volume was also associated with prognosis...
November 2016: Oncology Letters
https://www.readbyqxmd.com/read/27887643/distribution-of-fdg-avid-nodes-in-esophageal-cancer-implications-for-radiotherapy-target-delineation
#6
Brandon Garcia, Karyn A Goodman, Lajhem Cambridge, Mark Dunphy, Abraham J Wu
PURPOSE: Clinical target volumes (CTV) for radiotherapy (RT) in esophageal cancer (EC) are based on standard expansions of primary tumor volume. Data is needed to define regions at highest risk for occult disease, based on histology and location of the primary tumor. We therefore reviewed PET scans in EC patients to characterize the location of FDG-avid lymph node metastases (LNM). MATERIALS AND METHODS: We identified 473 EC patients with reviewable pre-treatment PET-CT scans...
November 25, 2016: Radiation Oncology
https://www.readbyqxmd.com/read/27875103/diffusion-weighted-imaging-as-a-treatment-response-biomarker-for-evaluating-bone-metastases-in-prostate-cancer-a-pilot-study
#7
Raquel Perez-Lopez, Joaquin Mateo, Helen Mossop, Matthew D Blackledge, David J Collins, Mihaela Rata, Veronica A Morgan, Alison Macdonald, Shahneen Sandhu, David Lorente, Pasquale Rescigno, Zafeiris Zafeiriou, Diletta Bianchini, Nuria Porta, Emma Hall, Martin O Leach, Johann S de Bono, Dow-Mu Koh, Nina Tunariu
Purpose To determine the usefulness of whole-body diffusion-weighted imaging (DWI) to assess the response of bone metastases to treatment in patients with metastatic castration-resistant prostate cancer (mCRPC). Materials and Methods A phase II prospective clinical trial of the poly-(adenosine diphosphate-ribose) polymerase inhibitor olaparib in mCRPC included a prospective magnetic resonance (MR) imaging substudy; the study was approved by the institutional research board, and written informed consent was obtained...
November 22, 2016: Radiology
https://www.readbyqxmd.com/read/27846378/tumor-delineation-and-quantitative-assessment-of-glucose-metabolic-rate-within-histologic-subtypes-of-non-small-cell-lung-cancer-by-using-dynamic-18-f-fluorodeoxyglucose-pet
#8
Tineke W H Meijer, Lioe-Fee de Geus-Oei, Eric P Visser, Wim J G Oyen, Monika G Looijen-Salamon, Dimitris Visvikis, Ad F T M Verhagen, Johan Bussink, Dennis Vriens
Purpose To assess whether dynamic fluorine 18 ((18)F) fluorodeoxyglucose (FDG) positron emission tomography (PET) has added value over static (18)F-FDG PET for tumor delineation in non-small cell lung cancer (NSCLC) radiation therapy planning by using pathology volumes as the reference standard and to compare pharmacokinetic rate constants of (18)F-FDG metabolism, including regional variation, between NSCLC histologic subtypes. Materials and Methods The study was approved by the institutional review board. Patients gave written informed consent...
November 15, 2016: Radiology
https://www.readbyqxmd.com/read/27843735/interhemispheric-difference-images-from-postoperative-diffusion-tensor-imaging-of-gliomas
#9
Robert Kosztyla, Stefan A Reinsberg, Vitali Moiseenko, Brian Toyota, Alan Nichol
Introduction Determining the full extent of gliomas during radiotherapy planning can be challenging with conventional T1 and T2 magnetic resonance imaging (MRI). The purpose of this study was to develop a method to automatically calculate differences in the fractional anisotropy (FA) and mean diffusivity (MD) values in target volumes obtained with diffusion tensor imaging (DTI) by comparing with values from anatomically homologous voxels on the contralateral side of the brain. Methods Seven patients with a histologically confirmed glioma underwent postoperative radiotherapy planning with 1...
October 5, 2016: Curēus
https://www.readbyqxmd.com/read/27837437/intra-rater-variability-in-low-grade-glioma-segmentation
#10
Hans Kristian Bø, Ole Solheim, Asgeir Store Jakola, Kjell-Arne Kvistad, Ingerid Reinertsen, Erik Magnus Berntsen
Assessment of size and growth are key radiological factors in low-grade gliomas (LGGs), both for prognostication and treatment evaluation, but the reliability of LGG-segmentation is scarcely studied. With a diffuse and invasive growth pattern, usually without contrast enhancement, these tumors can be difficult to delineate. The aim of this study was to investigate the intra-observer variability in LGG-segmentation for a radiologist without prior segmentation experience. Pre-operative 3D FLAIR images of 23 LGGs were segmented three times in the software 3D Slicer...
November 11, 2016: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/27834628/consensus-guidelines-for-postoperative-stereotactic-body-radiation-therapy-for-spinal-metastases-results-of-an-international-survey
#11
Kristin J Redmond, Simon S Lo, Scott G Soltys, Yoshiya Yamada, Igor J Barani, Paul D Brown, Eric L Chang, Peter C Gerszten, Samuel T Chao, Robert J Amdur, Antonio A F De Salles, Matthias Guckenberger, Bin S Teh, Jason Sheehan, Charles R Kersh, Michael G Fehlings, Moon-Jun Sohn, Ung-Kyu Chang, Samuel Ryu, Iris C Gibbs, Arjun Sahgal
OBJECTIVE Although postoperative stereotactic body radiation therapy (SBRT) for spinal metastases is increasingly performed, few guidelines exist for this application. The purpose of this study is to develop consensus guidelines to promote safe and effective treatment for patients with spinal metastases. METHODS Fifteen radiation oncologists and 5 neurosurgeons, representing 19 centers in 4 countries and having a collective experience of more than 1300 postoperative spine SBRT cases, completed a 19-question survey about postoperative spine SBRT practice...
November 11, 2016: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/27829431/radiomics-based-targeted-radiotherapy-planning-rad-trap-a-computational-framework-for-prostate-cancer-treatment-planning-with-mri
#12
Rakesh Shiradkar, Tarun K Podder, Ahmad Algohary, Satish Viswanath, Rodney J Ellis, Anant Madabhushi
BACKGROUND: Radiomics or computer - extracted texture features have been shown to achieve superior performance than multiparametric MRI (mpMRI) signal intensities alone in targeting prostate cancer (PCa) lesions. Radiomics along with deformable co-registration tools can be used to develop a framework to generate targeted focal radiotherapy treatment plans. METHODS: The Rad-TRaP framework comprises three distinct modules. Firstly, a module for radiomics based detection of PCa lesions on mpMRI via a feature enabled machine learning classifier...
November 10, 2016: Radiation Oncology
https://www.readbyqxmd.com/read/27823640/impact-of-pet-ct-on-radiation-treatment-in-patients-with-esophageal-cancer-a-systematic-review
#13
REVIEW
Jing Lu, Xiang-Dong Sun, Xi Yang, Xin-Yu Tang, Qin Qin, Hong-Cheng Zhu, Hong-Yan Cheng, Xin-Chen Sun
PURPOSE: With the advances in radiotracers, positron emission tomography/computed tomography (PET/CT) is recognized as a useful adjunct to anatomic imaging with CT, MRI and endoscopic ultrasonography (EUS). The objective of this review was to comprehensively analyze the roles of PET/CT for the radiotherapy of esophageal cancer. METHODS: In this review, we focused on issues concerning the application of PET/CT in TNM staging, target volume delineation and response to therapy, both for the primary tumor and regional lymph nodes...
November 2016: Critical Reviews in Oncology/hematology
https://www.readbyqxmd.com/read/27816363/patterns-of-primary-tumor-invasion-and-regional-lymph-node-spread-based-on-magnetic-resonance-imaging-in-early-stage-nasal-nk-t-cell-lymphoma-implications-for-clinical-target-volume-definition-and-prognostic-significance
#14
Run-Ye Wu, Kang Liu, Wei-Hu Wang, Jing Jin, Yong-Wen Song, Shu-Lian Wang, Yue-Ping Liu, Hua Ren, Hui Fang, Qing-Feng Liu, Yong Yang, Bo Chen, Shu-Nan Qi, Ning-Ning Lu, Yu Tang, Yuan Tang, Ning Li, Han Ouyang, Ye-Xiong Li
PURPOSE: This study aimed to determine the pathways of primary tumor invasion (PTI) and regional lymph node (LN) spread based on magnetic resonance imaging (MRI) in early-stage nasal NK/T-cell lymphoma (NKTCL), to improve clinical target volume (CTV) delineation and evaluate the prognostic value of locoregional extension patterns. METHODS AND MATERIALS: A total of 105 patients with newly diagnosed early-stage nasal NKTCL who underwent pretreatment MRI were retrospectively reviewed...
September 17, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27811130/impact-of-neuroradiology-based-peer-review-on-head-and-neck-radiotherapy-target-delineation
#15
S Braunstein, C M Glastonbury, J Chen, J M Quivey, S S Yom
BACKGROUND AND PURPOSE: While standard guidelines assist in target delineation for head and neck radiation therapy planning, the complex anatomy, varying patterns of spread, unusual or advanced presentations, and high risk of treatment-related toxicities produce continuous interpretive challenges. In 2007, we instituted weekly treatment planning quality assurance rounds as a joint enterprise of head and neck radiation oncology and neuroradiology. Here we describe its impact on head and neck radiation therapy target delineation...
November 3, 2016: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/27806589/real-time-4d-dose-reconstruction-for-tracked-dynamic-mlc-deliveries-for-lung-sbrt
#16
Cornelis Ph Kamerling, Martin F Fast, Peter Ziegenhein, Martin J Menten, Simeon Nill, Uwe Oelfke
PURPOSE: This study provides a proof of concept for real-time 4D dose reconstruction for lung stereotactic body radiation therapy (SBRT) with multileaf collimator (MLC) tracking and assesses the impact of tumor tracking on the size of target margins. METHODS: The authors have implemented real-time 4D dose reconstruction by connecting their tracking and delivery software to an Agility MLC at an Elekta Synergy linac and to their in-house treatment planning software (TPS)...
November 2016: Medical Physics
https://www.readbyqxmd.com/read/27806121/fully-automated-enhanced-tumor-compartmentalization-man-vs-machine-reloaded
#17
Nicole Porz, Simon Habegger, Raphael Meier, Rajeev Verma, Astrid Jilch, Jens Fichtner, Urspeter Knecht, Christian Radina, Philippe Schucht, Jürgen Beck, Andreas Raabe, Johannes Slotboom, Mauricio Reyes, Roland Wiest
OBJECTIVE: Comparison of a fully-automated segmentation method that uses compartmental volume information to a semi-automatic user-guided and FDA-approved segmentation technique. METHODS: Nineteen patients with a recently diagnosed and histologically confirmed glioblastoma (GBM) were included and MR images were acquired with a 1.5 T MR scanner. Manual segmentation for volumetric analyses was performed using the open source software 3D Slicer version 4.2.2.3 (www...
2016: PloS One
https://www.readbyqxmd.com/read/27789716/parametric-net-influx-rate-images-of-68ga-dotatoc-and-68ga-dotatate-quantitative-accuracy-and-improved-image-contrast
#18
Ezgi Ilan, Mattias Sandström, Irina Velikyan, Anders Sundin, Barbro Eriksson, Mark Lubberink
: (68)Ga-DOTATOC and (68)Ga-DOTATATE are radiolabelled somatostatin analogs used for diagnosis of somatostatin receptor expressing neuroendocrine tumors (NETs) and SUV -measurements are suggested for treatment monitoring. However, changes in net-influx rate (Ki) may better reflect treatment effects than those of the SUV, and accordingly there is a need to compute parametric images showing Ki at the voxel level. The aim of this study was to evaluate parametric methods for computation of parametric Ki images by comparison to volume of interest based methods and to assess image contrast in terms of tumor-to-liver ratio...
October 27, 2016: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/27788952/comparison-of-computed-tomography-and-magnetic-resonance-imaging-based-clinical-target-volume-contours-at-brachytherapy-for%C3%A2-cervical-cancer
#19
Cameron W Swanick, Katherine O Castle, Sastry Vedam, Mark F Munsell, Lehendrick M Turner, Gaiane M Rauch, Anuja Jhingran, Patricia J Eifel, Ann H Klopp
PURPOSE: We prospectively compared computed tomography (CT)- and magnetic resonance imaging (MRI)-based high-risk clinical target volume (HR-CTV) contours at the time of brachytherapy for cervical cancer in an effort to identify patients who might benefit most from MRI-based planning. METHODS AND MATERIALS: Thirty-seven patients who had undergone a pretreatment diagnostic MRI scan were included in the analysis. We delineated the HR-CTV on the brachytherapy CT and brachytherapy MRI scans independently for each patient...
November 15, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27788948/analysis-of-lung-tumor-motion-in-a-large-sample-patterns-and-factors-influencing-precise-delineation-of-internal-target-volume
#20
Lukas Knybel, Jakub Cvek, Lukas Molenda, Natalie Stieberova, David Feltl
PURPOSE/OBJECTIVE: To evaluate lung tumor motion during respiration and to describe factors affecting the range and variability of motion in patients treated with stereotactic ablative radiation therapy. METHODS AND MATERIALS: Log file analysis from online respiratory tumor tracking was performed in 145 patients. Geometric tumor location in the lungs, tumor volume and origin (primary or metastatic), sex, and tumor motion amplitudes in the superior-inferior (SI), latero-lateral (LL), and anterior-posterior (AP) directions were recorded...
November 15, 2016: International Journal of Radiation Oncology, Biology, Physics
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