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tumor volume delineation

Attila Forgacs, Hermann Pall Jonsson, Magnus Dahlbom, Freddie Daver, Matthew D DiFranco, Gabor Opposits, Aron K Krizsan, Ildiko Garai, Johannes Czernin, Jozsef Varga, Lajos Tron, Laszlo Balkay
Textural analysis might give new insights into the quantitative characterization of metabolically active tumors. More than thirty textural parameters have been investigated in former F18-FDG studies already. The purpose of the paper is to declare basic requirements as a selection strategy to identify the most appropriate heterogeneity parameters to measure textural features. Our predefined requirements were: a reliable heterogeneity parameter has to be volume independent, reproducible, and suitable for expressing quantitatively the degree of heterogeneity...
2016: PloS One
Stephanie Casey, Lara Best, Olga Vujovic, Kevin Jordan, Barbara Fisher, Deborah Carey, Deborah Bourdeau, Edward Yu
PURPOSE : Non-melanotic skin cancers remain the most commonly diagnosed cancers. Radiotherapy and surgery are the most common treatment options. Radiotherapy has a recurrence rate of up to 20% for basal or squamous cell cancers. One of the difficulties is to determine the extent of disease for poorly demarcated tumors. This study utilizes protoporphyrin (PpIX) fluorescence to provide information on the extent of subclinical disease for poorly demarcated tumors treated with radiotherapy...
September 4, 2016: Curēus
Hoibin Jeong, Seoyeon Bok, Beom-Ju Hong, Hyung-Seok Choi, G-One Ahn
Recent advancement in the radiotherapy technology has allowed conformal delivery of high doses of ionizing radiation precisely to the tumors while sparing large volume of the normal tissues, which have led to better clinical responses. Despite this technological advancement many advanced tumors often recur and they do so within the previously irradiated regions. How could tumors recur after receiving such high ablative doses of radiation? In this review, we outlined how radiation can elicit anti-tumor responses by introducing some of the cytokines that can be induced by ionizing radiation...
September 2016: Blood Research
Oliver Oehlke, Michael Mix, Erika Graf, Tanja Schimek-Jasch, Ursula Nestle, Irina Götz, Sabine Schneider-Fuchs, Astrid Weyerbrock, Irina Mader, Brigitta G Baumert, Susan C Short, Philipp T Meyer, Wolfgang A Weber, Anca-Ligia Grosu
BACKGROUND: The higher specificity of amino-acid positron emission tomography (AA-PET) in the diagnosis of gliomas, as well as in the differentiation between recurrence and treatment-related alterations, in comparison to contrast enhancement in T1-weighted MRI was demonstrated in many studies and is the rationale for their implementation into radiation oncology treatment planning. Several clinical trials have demonstrated the significant differences between AA-PET and standard MRI concerning the definition of the gross tumor volume (GTV)...
October 5, 2016: BMC Cancer
Michael J Cross, Gail S Lebovic, Joseph Ross, Scott Jones, Arnold Smith, Steven Harms
BACKGROUND: Techniques for accurately delineating the tumor bed after breast-conserving surgery (BCS) can be challenging. As a result, the accuracy, and efficiency of radiation treatment (RT) planning can be negatively impacted. Surgically placed clips or the post-surgical seroma are commonly used to determine target volume; however, these methods can lead to a high degree of uncertainty and variability. A novel 3-dimensional bioabsorbable marker was used during BCS and assessed for its impact on RT planning...
October 5, 2016: World Journal of Surgery
Mayur Sharma, Ghaith Habboub, Mandana Behbahani, Danilo Silva, Gene H Barnett, Alireza M Mohammadi
OBJECTIVE Laser interstitial thermal therapy (LITT) has been increasingly used to treat deep-seated tumors. Despite its being minimally invasive, there is a risk of LITT damaging adjacent critical structures, including corticospinal tracts (CSTs). In this study, the authors investigated the predictive value of overlap between the hyperthermic field and CSTs in determining postoperative motor deficit (PMDs). METHODS More than 140 patients underwent an LITT procedure in our institution between April 2011 and June 2015...
October 2016: Neurosurgical Focus
Danielle N Margalit, Bhupendra Rawal, Paul J Catalano, Robert I Haddad, Laura A Goguen, Donald J Annino, Sewanti A Limaye, Jochen H Lorch, Annie W Lavigne, Jonathan D Schoenfeld, David J Sher, Roy B Tishler
PURPOSE: To describe patterns of failure (POF) after reirradiation (reRT) with intensity modulated radiation therapy (IMRT) for recurrent/second primary squamous cell carcinoma of the head and neck. METHODS: From 08/2004-02/2013, 75 consecutive patients received reRT with IMRT. Gross tumor was generally treated with a 5mm planning target volume (PTV) margin. For postoperative cases, a 5mm PTV was added to the clinical target volume which included the postoperative bed...
October 2016: Oral Oncology
Karolien Verhoeven, Stéphanie Peeters, Katrien Erven, Hilde Janssen, Isabelle Kindts, Erik Van Limbergen, Annouschka Laenen, Saskia Petillion, Caroline Weltens
PURPOSE: The purpose of this article is to compare isotropic and anisotropic margin expansion with regard to the size of the clinical target volume boost (CTVboost) and the interobserver variability (IOV). METHODS AND MATERIALS: Lumpectomy cavities marked with 3 or more surgical clips were delineated by 6 radiation oncologists who specialized in breast radiation therapy. CTVboost anisotropic was created by manually expanding the tumor bed with an anisotropic margin of 15 mm (20 mm in case of extensive intraductal component) minus the surgical free margins in 6 directions (anteroposterior, craniocaudal, and superoinferior)...
March 19, 2016: Practical Radiation Oncology
Y Song, X Chen, B A Erickson, A Li
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
Tom Konert, Wouter V Vogel, Sarah Everitt, Michael P MacManus, Daniela Thorwarth, Elena Fidarova, Diana Paez, Jan-Jakob Sonke, Gerard G Hanna
BACKGROUND AND PURPOSE: To assess the impact of a standardized delineation protocol and training interventions on PET/CT-based target volume delineation (TVD) in NSCLC in a multicenter setting. MATERIAL AND METHODS: Over a one-year period, 11 pairs, comprised each of a radiation oncologist and nuclear medicine physician with limited experience in PET/CT-based TVD for NSCLC from nine different countries took part in a training program through an International Atomic Energy Agency (IAEA) study (NCT02247713)...
September 20, 2016: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
Martje Marie Terheyden, Corinna Melchert, György Kovács
PURPOSE: This study aims to compare the dosimetric data of local tumor's bed dose escalation (boost) with photon beams (external beam radiation therapy - EBRT) versus high-dose-rate interstitial brachytherapy (HDR-BT) after breast-conserving treatment in women with early-stage breast cancer. MATERIAL AND METHODS: We analyzed the treatment planning data of 136 irradiated patients, treated between 2006 and 2013, who underwent breast-conserving surgery and adjuvant whole breast irradiation (WBI; 50...
August 2016: Journal of Contemporary Brachytherapy
Justin K Mikell, Armeen Mahvash, Wendy Siman, Veera Baladandayuthapani, Firas Mourtada, S Cheenu Kappadath
PURPOSE: To quantify differences that exist between dosimetry models used for (90)Y selective internal radiation therapy (SIRT). METHODS AND MATERIALS: Retrospectively, 37 tumors were delineated on 19 post-therapy quantitative (90)Y single photon emission computed tomography/computed tomography scans. Using matched volumes of interest (VOIs), absorbed doses were reported using 3 dosimetry models: glass microsphere package insert standard model (SM), partition model (PM), and Monte Carlo (MC)...
July 27, 2016: International Journal of Radiation Oncology, Biology, Physics
Soren Moller, Ian Law, Per Munck Af Rosenschold, Junia Costa, Hans Skovgaard Poulsen, Svend Aage Engelholm, Silke Engelholm
BACKGROUND AND PURPOSE: Positron emission tomography (PET) provides quantitative metabolic information and potential biomarkers of treatment outcome. We aimed to determine the prognostic value of early (18)F-fluoroethyl-tyrosine ((18)F-FET) PET scans acquired during re-irradiation for recurrent high-grade glioma (HGG). MATERIAL AND METHODS: A phase I clinical trial of re-irradiation of HGG was carried out. MRI and (18)F-FET PET were used for target delineation and follow-up...
September 9, 2016: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
Jochen Fleckenstein, Michael Jelden, Stephanie Kremp, Philippe Jagoda, Jonas Stroeder, Fadi Khreish, Samer Ezziddin, Arno Buecker, Christian Rübe, Guenther K Schneider
OBJECTIVE: The study was designed to evaluate diffusion-weighted magnetic resonance imaging (DWI) vs. PET-CT of the thorax in the determination of gross tumor volume (GTV) in radiotherapy planning of non-small-cell lung cancer (NSCLC). MATERIALS AND METHODS: Eligible patients with NSCLC who were supposed to receive definitive radio(chemo)therapy were prospectively recruited. For MRI, a respiratory gated T2-weighted sequence in axial orientation and non-gated DWI (b = 0, 800, 1,400 and apparent diffusion coefficient map [ADC]) were acquired on a 1...
2016: PloS One
Koujiro Ikushima, Hidetaka Arimura, Ze Jin, Hidetake Yabu-Uchi, Jumpei Kuwazuru, Yoshiyuki Shioyama, Tomonari Sasaki, Hiroshi Honda, Masayuki Sasaki
We have proposed a computer-assisted framework for machine-learning-based delineation of gross tumor volumes (GTVs) following an optimum contour selection (OCS) method. The key idea of the proposed framework was to feed image features around GTV contours (determined based on the knowledge of radiation oncologists) into a machine-learning classifier during the training step, after which the classifier produces the 'degree of GTV' for each voxel in the testing step. Initial GTV regions were extracted using a support vector machine (SVM) that learned the image features inside and outside each tumor region (determined by radiation oncologists)...
September 8, 2016: Journal of Radiation Research
Elise Anne Jager, Hans Ligtenberg, Joana Caldas-Magalhaes, Tim Schakel, Marielle E Philippens, Frank A Pameijer, Nicolien Kasperts, Stefan M Willems, Christiaan H Terhaard, Cornelis P Raaijmakers
BACKGROUND: Validation of magnetic resonance imaging (MRI) and development of guidelines for the delineation of the gross tumor volume (GTV) is of utmost importance to benefit from the visibility of anatomical details on MR images and to achieve an accurate GTV delineation. In the ideal situation, the GTV delineation corresponds to the histopathologically determined 'true tumor volume'. Consequently, we developed guidelines for GTV delineation of laryngeal and hypopharyngeal tumors on MRI and determined the accuracy of the resulting delineation of the tumor outline on histopathology as gold standard...
November 2016: Acta Oncologica
Isabelle Fitton, Joop C Duppen, Roel J H M Steenbakkers, Heidi Lotz, Peter J C M Nowak, Coen R N Rasch, Marcel van Herk
BACKGROUND AND PURPOSE: To study the impact of coronal and sagittal views (CSV) on the gross tumor volume (GTV) delineation on CT and matched PET/CT scans in non-small cell lung cancer. MATERIAL AND METHODS: GTV delineations were performed by 11 experienced radiation oncologists on CT and PET/CT in 22 patients. Two tumor groups were defined: Group I: Primary tumors surrounded by lung or visceral pleura, without venous invasion, and without large extensions to the chest wall or the mediastinum...
September 2016: Physica Medica: PM
Sabrina T Heijkoop, Henrike Westerveld, Nina Bijker, Raphael Feije, Abdul W Sharfo, Niek van Wieringen, Jan Willem M Mens, Lukas J A Stalpers, Mischa S Hoogeman
PURPOSE/OBJECTIVE: It is unknown whether the historically found dosimetric advantages of treating gynecologic cancer with the patient in a prone position with use of a small-bowel displacement device (belly-board) remain when volumetric arc therapy (VMAT) is used and whether these advantages depend on the necessary margin between clinical target volume (CTV) and planning target volume (PTV). The aim of this study is to determine the best patient position (prone or supine) in terms of sparing organs at risk (OAR) for various CTV-to-PTV margins and VMAT dose delivery...
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
Cheng B Saw, Frank Battin, Janice McKeague, Meghan Haggerty, Madhava Baikadi, Christopher Peters
Dose or treatment planning management is necessary for the re-irradiation of intracranial relapses after focal irradiation, radiosurgery, or stereotactic radiotherapy. The current clinical guidelines for metastatic brain tumors are the use of focal irradiation if the patient presents with 4 lesions or less. Salvage treatments with the use of whole brain radiation therapy (WBRT) can then be used to limit disease progression if there is an intracranial relapse. However, salvage WBRT poses a number of challenges in dose planning to limit disease progression and preserve neurocognitive function...
September 1, 2016: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
Emma Holliday, Clifton D Fuller, Jayashree Kalpathy-Cramer, Daniel Gomez, Andreas Rimner, Ying Li, Suresh Senan, Lynn D Wilson, Jehee Choi, Ritsuko Komaki, Charles R Thomas
OBJECTIVES: We sought to quantitatively determine the inter-observer variability of expert radiotherapy target-volume delineation for thymic cancers, as part of a larger effort to develop an expert-consensus contouring atlas. METHODS: A pilot dataset was created consisting of a standardized case presentation with pre- and post-operative DICOM CT image sets from a single patient with Masaoka-Koga Stage III thymoma. Expert thoracic radiation oncologists delineated tumor targets on the pre- and post-operative scans as they would for a definitive and adjuvant case, respectively...
March 2016: Journal of Radiation Oncology
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