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Radonic S, Besserer J, Rohrer Bley C, Schneider U, Meier VS. A concept for anisotropic PTV margins including rotational setup uncertainties and its impact on the tumor control probability in canine brain tumors. Biomed Phys Eng Express 2022; 8. [PMID: 35981496 DOI: 10.1088/2057-1976/ac8a9f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 08/18/2022] [Indexed: 11/11/2022]
Abstract
OBJECTIVE In this modelling study, we pursued two main goals. The first was to establish a new CTV-to-PTV expansion which considers the closest and most critical organ at risk (OAR). The second goal was to investigate the impact of the planning target volume (PTV) margin size on the tumor control probability (TCP) and its dependence on the geometrical setup uncertainties. The aim was to achieve a smaller margin expansion close to the OAR while allowing a moderately larger expansion in less critical areas further away from the OAR and whilst maintaining the TCP. APPROACH Imaging data of radiation therapy plans from pet dogs which had undergone radiation therapy for brain tumor were used to estimate the clinic specific rotational setup uncertainties. A Monte-Carlo methodology using a voxel-based TCP model was used to quantify the implications of rotational setup uncertainties on the TCP. A combination of algorithms was utilized to establish a computational CTV-to-PTV expansion method based on probability density. This was achieved by choosing a center of rotation close to an OAR. All required software modules were developed and integrated into a software package that directly interacts with the Varian Eclipse treatment planning system. MAIN RESULTS Several uniform and non-isotropic PTVs were created. To ensure comparability and consistency, standardized RT plans with equal optimization constraints were defined, automatically applied and calculated on these targets. The resulting TCPs were then computed, evaluated and compared. SIGNIFICANCE The non-isotropic margins were found to result in larger TCPs with smaller margin excess volume. Further, we presented an additional application of the newly established CTV-to-PTV expansion method for radiation therapy of the spinal axis of human patients.
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Affiliation(s)
- Stephan Radonic
- Department of Physics, University of Zurich Faculty of Science, Winterthurerstrasse 190, Zurich, ZH, 8057, SWITZERLAND
| | - Jürgen Besserer
- Radiotherapy Hirslanden, Hirslanden Klinik Hirslanden, Witelikerstrasse 40, Zurich, Zürich, 8032, SWITZERLAND
| | - Carla Rohrer Bley
- Division of Radiation Oncology, Small Animal Department, University of Zurich Vetsuisse Faculty, Winterthurerstrasse 260, Zurich, Zürich, 8057, SWITZERLAND
| | - Uwe Schneider
- Radiotherapy Hirslanden, Hirslanden Klinik Hirslanden, Witellikerstrasse 40, Zurich, Zürich, 8032, SWITZERLAND
| | - Valeria Sabina Meier
- Division of Radiation Oncology, Small Animal Department, University of Zurich Vetsuisse Faculty, Winterthrerstrasse 260, Zurich, Zürich, 8057, SWITZERLAND
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Iseri T, Hira N, Tanabe Y, Horikirizono H, Sunahara H, Itoh H, Nemoto Y, Itamoto K, Tani K, Nakaichi M. Evaluation of setup errors of immobilization device for radiation therapy in companion animals. Open Vet J 2022; 12:929-935. [PMID: 36650854 PMCID: PMC9805779 DOI: 10.5455/ovj.2022.v12.i6.19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Accepted: 11/01/2022] [Indexed: 12/26/2022] Open
Abstract
Background Intensity-modulated radiotherapy (IMRT), which allows generating steep dose gradients, is a beneficial treatment for companion animals with adjacent target and risk organs. IMRT is essential for high setup accuracy for avoiding overdose to risk organs, and optimal radiotherapy is important for evaluating the setup accuracy of companion animals. Aim To use an immobilization device to evaluate setup errors in radiotherapy for companion animals. Methods We calculated setup errors in radiotherapy for 386 animals (dogs and cats; 3,261 registration images) that underwent radiotherapy between 2016 and 2022. The companion animals were immobilized with a customized bite block and vacuum lock device. A quantile-quantile plot with 95% confidence interval (CI) was used to evaluate the histogram of the setup errors, and the systematic and random setup errors were calculated for each region (brain, head and neck, chest and abdomen, pelvis, and spine). Results The setup error in each direction presented an extremely narrow-interval histogram, with the following lower and upper 95% CIs: cranial-caudal (-0.08, -0.06 cm); left-right (-0.04, -0.02 cm); and dorsal-ventral (-0.13, -0.11 cm). The mean systematic setup error was 0.16 cm (range: 0.12-0.36 cm), and the random error was 0.15 cm (range: 0.08-0.34 cm). The pelvis showed the highest systematic and random setup errors (mean: 0.36 and 0.23 cm, respectively). Conclusion The use of an immobilization device enables highly accurate radiotherapy for companion animals (95% CI < 0.15 cm).
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Affiliation(s)
- Toshie Iseri
- Faculty of Agriculture, Animal Medical Emergency Center, Tokyo University of Agriculture and Technology, Tokyo, Japan
| | - Nanami Hira
- Facilty of Health Sciences, Okayama University Medical School, Okayama, Japan
| | - Yoshinori Tanabe
- Faculty of Medicine, Graduate School of Health Sciences, Okayama University, Okayama, Japan,Corresponding Author: Yoshinori Tanabe. Faculty of Medicine, Graduate School of Health Sciences, Okayama University, Okayama, Japan.
| | - Hiro Horikirizono
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Hiroshi Sunahara
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Harumichi Itoh
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Yuki Nemoto
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Kazuhito Itamoto
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Kenji Tani
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Munekazu Nakaichi
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
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Wolf F, Rohrer Bley C, Besserer J, Meier V. Estimation of planning organ at risk volumes for ocular structures in dogs undergoing three-dimensional image-guided periocular radiotherapy with rigid bite block immobilization. Vet Radiol Ultrasound 2021; 62:246-254. [PMID: 33460237 PMCID: PMC7986628 DOI: 10.1111/vru.12955] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 10/20/2020] [Accepted: 11/23/2020] [Indexed: 12/17/2022] Open
Abstract
Planning organ at risk volume (PRV) estimates have been reported as methods for sparing organs at risk (OARs) during radiation therapy, especially for hypofractioned and/or dose‐escalated protocols. The objectives of this retrospective, analytical, observational study were to evaluate peri‐ocular OAR shifts and derive PRVs in a sample of dogs undergoing radiation therapy for periocular tumors. Inclusion criteria were as follows: dogs irradiated for periocular tumors, with 3D‐image‐guidance and at least four cone‐beam CTs (CBCTs) used for position verification, and positioning in a rigid bite block immobilization device. Peri‐ocular OARs were contoured on each CBCT and the systematic and random error of the shifts in relation to the planning CT position computed. The formula 1.3×Σ+0.5xσ was used to generate a PRV of each OAR in the dorsoventral, mediolateral, and craniocaudal axis. A total of 30 dogs were sampled, with 450 OARs contoured, and 2145 shifts assessed. The PRV expansion was qualitatively different for each organ (1‐4 mm for the dorsoventral and 1‐2 mm for the mediolateral and craniocaudal axes). Maximal PRV expansion was ≤4 mm and directional for the majority; most pronounced for corneas and retinas. Findings from the current study may help improve awareness of and minimization of radiation dose in peri‐ocular OARs for future canine patients. Because some OARs were difficult to visualize on CBCTs and/ or to delineate on the planning CT, authors recommend that PRV estimates be institution‐specific and applied with caution.
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Affiliation(s)
- Friederike Wolf
- Division of Radiation Oncology, Small Animal Department, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Carla Rohrer Bley
- Division of Radiation Oncology, Small Animal Department, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Jürgen Besserer
- Division of Radiation Oncology, Small Animal Department, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland.,Department of Physics, University of Zurich, Zurich, Switzerland.,Radiation Oncology, Hirslanden Clinic, Zurich, Switzerland
| | - Valeria Meier
- Division of Radiation Oncology, Small Animal Department, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland.,Department of Physics, University of Zurich, Zurich, Switzerland
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Wolf F, Meier VS, Pot SA, Rohrer Bley C. Ocular and periocular radiation toxicity in dogs treated for sinonasal tumors: A critical review. Vet Ophthalmol 2020; 23:596-610. [PMID: 32281234 PMCID: PMC7496316 DOI: 10.1111/vop.12761] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 02/26/2020] [Accepted: 03/16/2020] [Indexed: 12/25/2022]
Abstract
Visual impairment from radiation‐induced damage can be painful, disabling, and reduces the patient's quality of life. Ocular tissue damage can result from the proximity of ocular organs at risk to irradiated sinonasal target volumes. As toxicity depends on the radiation dose delivered to a certain volume, dose‐volume constraints for organs at risk should ideally be known during treatment planning in order to reduce toxicity. Herein, we summarize published ocular toxicity data of dogs irradiated for sinonasal tumors from 36 publications (1976‐2018). In particular, we tried to extract a dose guideline for a clinically acceptable rate of ocular toxicity. The side effects to ocular and periocular tissues were reported in 26/36 studies (72%) and graded according to scoring systems (10/26; 39%). With most scoring systems, however, toxicities of different ocular and periocular tissues are summed into one score. Further, the scores were mostly applied in retrospect and lack volume‐ and dose‐data. This incomplete information reflects the crux of the matter for radiation dose tolerance in canine ocular tissues: The published information of the last three decades does not allow formulating dose‐volume guidelines. As a start, we can only state that a mean dose of 39 Gy (given in 10 x 4.2 Gy fractions) will lead to loss of vision by one or both eyes, while mean doses of <30 Gy seem to preserve functionality. With a future goal to define tolerated doses and volumes of ocular and periocular tissues at risk, we propose the use of combined ocular toxicity scoring systems.
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Affiliation(s)
- Friederike Wolf
- Division of Radiation Oncology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Valeria S Meier
- Division of Radiation Oncology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland.,Department of Physics, University of Zurich, Zurich, Switzerland
| | - Simon A Pot
- Ophthalmology Section, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Carla Rohrer Bley
- Division of Radiation Oncology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
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5
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Evaluation of the effect of random setup errors on dose delivery in Intensity Modulated Radiotherapy. POLISH JOURNAL OF MEDICAL PHYSICS AND ENGINEERING 2020. [DOI: 10.2478/pjmpe-2020-0006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Aim: To conduct a study on the effect of random setup errors inpatient for dose delivery in Intensity Modulated Radiotherapy plans using Octavius 4D phantom.
Materials and methods: 11 patients with cancer of H&N were selected for this study. An IMRT plan was created for each patient. The IMRT quality assurance plans were transferred to Mosaiq workstation in a linear accelerator. These plans were delivered at the reference treatment position. Subsequently, the QA plans were delivered on the Octavius 4D phantom after introducing errors in various translational and rotational directions. The setup inaccuracies introduced varied from 1 mm to 5 mm along X, Y. These setup uncertainties were then introduced along X and Y direction simultaneously in equal measures. Similarly, IMRT plans were delivered also after introducing roll and yaw rotation of 1, 2 and 3 degrees in phantom. The deviation of gamma indices at all these positions was analyzed with respect to the reference setup position.
Results: The percentage of points passing the gamma acceptance criterion decrease as we increase the setup error. The change is found to be very insignificant with setup error up to 2 mm along X, Y or XY direction. Similarly, the rotational error of up to 3 degrees is found to be acceptable.
Conclusions: Small setup (< 2 mm) correction in patients may not adversely affect the dose delivery. But an error of similar magnitude in 2 directions simultaneously has a much greater impact on IMRT dose delivery.
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Rohrer Bley C, Meier VS, Besserer J, Schneider U. Intensity‐modulated radiation therapy dose prescription and reporting: Sum and substance of the International Commission on Radiation Units and Measurements Report 83 for veterinary medicine. Vet Radiol Ultrasound 2019; 60:255-264. [DOI: 10.1111/vru.12722] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Revised: 12/09/2018] [Accepted: 12/31/2018] [Indexed: 12/25/2022] Open
Affiliation(s)
- Carla Rohrer Bley
- Division of Radiation OncologyVetsuisse FacultyUniversity of Zurich Zurich Switzerland
| | - Valeria S. Meier
- Division of Radiation OncologyVetsuisse FacultyUniversity of Zurich Zurich Switzerland
| | - Juergen Besserer
- Division of Radiation OncologyVetsuisse FacultyUniversity of Zurich Zurich Switzerland
- Radiation OncologyHirslanden Clinic Zurich Switzerland
| | - Uwe Schneider
- Division of Radiation OncologyVetsuisse FacultyUniversity of Zurich Zurich Switzerland
- Radiation OncologyHirslanden Clinic Zurich Switzerland
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Nagata K. A retrospective analysis of radiation oncology related scientific articles in the journal Veterinary Radiology and Ultrasound: Trends over 40 years (1976-2015). Vet Radiol Ultrasound 2019; 60:351-357. [PMID: 30776858 DOI: 10.1111/vru.12716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 11/19/2018] [Accepted: 11/26/2018] [Indexed: 11/29/2022] Open
Abstract
The journal Veterinary Radiology & Ultrasound is a veterinary specialty journal devoted to the fields of veterinary diagnostic imaging and radiation oncology. The purpose of this retrospective, observational study is to evaluate progressive trends in radiation oncology articles published in Veterinary Radiology & Ultrasound during the 40-year period (1976-2015) and describe a shift of trends through several viewpoints. This 40-year period was divided into four subperiods: Period 1 (1976-1985), Period 2 (1986-1995), Period 3 (1996-2005), and Period 4 (2006-2015). These articles were divided into six categories based on the nature of the study: 1) studies related to teletherapy with endpoints being patient outcome, 2) radiation therapy dosimetry/planning, 3) patient setup, 4) reviews, 5) case reports, and 6) others. The number of radiation oncology articles in Veterinary Radiology & Ultrasound has increased over the 40-year period. The number of authors per article has increased between Periods 1 and 3. The number of articles related to linear accelerator has increased between Periods 3 and 4. The median number of treated patients per clinical article related to teletherapy ranged from 15 to 21, which has not changed significantly over the 40-year period. The most commonly used radiation therapy protocols during Periods 2 and 3 were fine-fractionated protocols (defined as 10 or more fractions), whereas coarse-fractionated protocols were more common during Periods 1 and 4. Findings from this study highlight the notable changes of trends in veterinary radiation oncology articles published in Veterinary Radiology & Ultrasound, which clearly reflect changes in the field of veterinary radiation oncology during the past 40 years.
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Affiliation(s)
- Koichi Nagata
- College of Veterinary Medicine, Department of Veterinary Biosciences & Diagnostic Imaging, The University of Georgia, Athens, GA 30602
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8
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Soukup A, Meier V, Pot S, Voelter K, Rohrer Bley C. A prospective pilot study on early toxicity from a simultaneously integrated boost technique for canine sinonasal tumours using image-guided intensity-modulated radiation therapy. Vet Comp Oncol 2018; 16:441-449. [PMID: 29761663 DOI: 10.1111/vco.12399] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Revised: 03/07/2018] [Accepted: 03/12/2018] [Indexed: 11/28/2022]
Abstract
In order to overcome the common local treatment failure of canine sinonasal tumours, integrated boost techniques were tried in the cobalt/orthovoltage era, but dismissed because of unacceptable early (acute) toxicity. Intriguingly, a recent calculation study of a simultaneously integrated boost (SIB) technique for sinonasal irradiation using intensity-modulated radiation therapy (IMRT) predicted theoretical feasibility. In this prospective pilot study we applied a commonly used protocol of 10 × 4.2 Gy to the planning target volume (PTV) with a 20%-SIB dose to the gross tumour volume (GTV). Our hypothesis expected this dose escalation to be clinically tolerable if applied with image-guided IMRT. We included 9 dogs diagnosed with sinonasal tumours without local/distant metastases. For treatment planning, organs at risk were contoured according to strict anatomical guidelines. Planning volume extensions (GTV/CTV/PTV) were standardized to minimize interplanner variability. Treatments were applied with rigid patient positioning and verified daily with image guidance. After radiation therapy, we set focus on early ophthalmologic complications as well as mucosal and cutaneous toxicity. Early toxicity was evaluated at week 1, 2, 3, 8 and 12 after radiotherapy. Only mild ophthalmologic complications were found. Three patients (33%) had self-limiting moderate to severe early toxicity (grade 3 mucositis) which was managed medically. No patient developed ulcerations/haemorrhage/necrosis of skin/mucosa. The SIB protocol applied with image-guided IMRT to treat canine sinonasal tumours led to clinically acceptable side effects. The suspected increased tumour control probability and the risk of late toxicity with the used dose escalation of 20% has to be further investigated.
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Affiliation(s)
- A Soukup
- Division of Radiation Oncology, Small Animal Department, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - V Meier
- Division of Radiation Oncology, Small Animal Department, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - S Pot
- Division of Ophthalmology, Equine Department, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - K Voelter
- Division of Ophthalmology, Equine Department, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - C Rohrer Bley
- Division of Radiation Oncology, Small Animal Department, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
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Christensen NI, Forrest LJ, White PJ, Henzler M, Turek MM. SINGLE INSTITUTION VARIABILITY IN INTENSITY MODULATED RADIATION TARGET DELINEATION FOR CANINE NASAL NEOPLASIA. Vet Radiol Ultrasound 2016; 57:639-645. [PMID: 27465316 DOI: 10.1111/vru.12398] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2015] [Revised: 06/09/2016] [Accepted: 06/12/2016] [Indexed: 11/29/2022] Open
Abstract
Contouring variability is a significant barrier to the accurate delivery and reporting of radiation therapy. The aim of this descriptive study was to determine the variation in contouring radiation targets and organs at risk by participants within our institution. Further, we also aimed to determine if all individuals contoured the same normal tissues. Two canine nasal tumor datasets were selected and contoured by two ACVR-certified radiation oncologists and two radiation oncology residents from the same institution. Eight structures were consistently contoured including the right and left eye, the right and left lens, brain, the gross tumor volume (GTV), clinical target volume (CTV), and planning target volume (PTV). Spinal cord, hard and soft palate, and bulla were contoured on 50% of datasets. Variation in contouring occurred in both targets and normal tissues at risk and was particularly significant for the GTV, CTV, and PTV. The mean metric score and dice similarity coefficient were below the threshold criteria in 37.5-50% and 12.5-50% of structures, respectively, quantitatively indicating contouring variation. This study refutes our hypothesis that minimal variation in target and normal tissue delineation occurs. The variation in contouring may contribute to different tumor response and toxicity for any given patient. Our results also highlight the difficulty associated with replication of published radiation protocols or treatments, as even with replete contouring description the outcome of treatment is still fundamentally influenced by the individual contouring the patient.
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Affiliation(s)
- Neil I Christensen
- Department of Surgical Sciences, School of Veterinary, Medicine, University of Wisconsin - Madison, Madison, WI.
| | - Lisa J Forrest
- Department of Surgical Sciences, School of Veterinary, Medicine, University of Wisconsin - Madison, Madison, WI
| | | | - Margaret Henzler
- Department of Surgical Sciences, School of Veterinary, Medicine, University of Wisconsin - Madison, Madison, WI
| | - Michelle M Turek
- Department of Medical Sciences, School of Veterinary, Medicine, University of Wisconsin - Madison, Madison, WI
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Hansen KS, Théon AP, Dieterich S, Kent MS. VALIDATION OF AN INDEXED RADIOTHERAPY HEAD POSITIONING DEVICE FOR USE IN DOGS AND CATS. Vet Radiol Ultrasound 2015; 56:448-55. [DOI: 10.1111/vru.12257] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Accepted: 01/15/2015] [Indexed: 11/30/2022] Open
Affiliation(s)
- Katherine S. Hansen
- Department of Surgical and Radiological Sciences; VM: Surgery Radiology, University of California; Davis CA USA 95616
| | - Alain P. Théon
- Department of Surgical and Radiological Sciences; VM: Surgery Radiology, University of California; Davis CA USA 95616
| | - Sonja Dieterich
- UC Davis Comprehensive Cancer Center; Radiation Oncology; Sacramento CA USA
| | - Michael S. Kent
- Department of Surgical and Radiological Sciences; VM: Surgery Radiology, University of California; Davis CA USA 95616
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12
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Keyerleber MA, McEntee MC, Farrelly J, Podgorsak M. Completeness of reporting of radiation therapy planning, dose, and delivery in veterinary radiation oncology manuscripts from 2005 to 2010. Vet Radiol Ultrasound 2012; 53:221-30. [PMID: 22092592 DOI: 10.1111/j.1740-8261.2011.01882.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Surrounding a shift toward evidence-based medicine and widespread adoption of reporting guidelines such as the Consolidated Standards of Reporting Trials (CONSORT) statement, there has been a growing body of literature evaluating the quality of reporting in human and veterinary medicine. These reviews have consistently demonstrated the presence of substantive deficiencies in completeness of reporting. The purpose of this study was to assess the current status of reporting in veterinary radiation oncology manuscripts in regards to treatment planning methods, dose, and delivery and to introduce a set of reporting guidelines to serve as a standard for future reporting. Forty-six veterinary radiation oncology manuscripts published between 2005 and 2010 were evaluated for reporting of 50 items pertaining to patient data, treatment planning, radiation dose, delivery of therapy, quality assurance, and adjunctive therapy. A mean of 40% of checklist items were reported in a given manuscript (range = 8-75%). Only 9/50 (18%) checklist items were reported in > or = 80% manuscripts. The completeness of reporting was best in regards to a statement of prescription radiation protocol (91-98% reported) and worst in regards to specification of absorbed dose within target volumes and surrounding normal tissues (0-6% reported). No manuscripts met the current International Commission of Radiation Units and Measurements (ICRU) dose specification recommendations. Incomplete reporting may stem from the predominance of retrospective manuscripts and the variability of protocols and equipment in veterinary radiation oncology. Adoption of reporting guidelines as outlined in this study is recommended to improve the quality of reporting in veterinary radiation oncology.
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Affiliation(s)
- Michele A Keyerleber
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA
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Kubicek LN, Seo S, Chappell RJ, Jeraj R, Forrest LJ. Helical tomotherapy setup variations in canine nasal tumor patients immobilized with a bite block. Vet Radiol Ultrasound 2012; 53:474-81. [PMID: 22731939 DOI: 10.1111/j.1740-8261.2012.01947.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2011] [Accepted: 04/07/2012] [Indexed: 12/25/2022] Open
Abstract
The purpose of our study was to compare setup variation in four degrees of freedom (vertical, longitudinal, lateral, and roll) between canine nasal tumor patients immobilized with a mattress and bite block, versus a mattress alone. Our secondary aim was to define a clinical target volume (CTV) to planning target volume (PTV) expansion margin based on our mean systematic error values associated with nasal tumor patients immobilized by a mattress and bite block. We evaluated six parameters for setup corrections: systematic error, random error, patient-patient variation in systematic errors, the magnitude of patient-specific random errors (root mean square [RMS]), distance error, and the variation of setup corrections from zero shift. The variations in all parameters were statistically smaller in the group immobilized by a mattress and bite block. The mean setup corrections in the mattress and bite block group ranged from 0.91 mm to 1.59 mm for the translational errors and 0.5°. Although most veterinary radiation facilities do not have access to Image-guided radiotherapy (IGRT), we identified a need for more rigid fixation, established the value of adding IGRT to veterinary radiation therapy, and define the CTV-PTV setup error margin for canine nasal tumor patients immobilized in a mattress and bite block.
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Sleeckx N, de Rooster H, Veldhuis Kroeze EJB, Van Ginneken C, Van Brantegem L. Canine mammary tumours, an overview. Reprod Domest Anim 2011; 46:1112-31. [PMID: 21645126 DOI: 10.1111/j.1439-0531.2011.01816.x] [Citation(s) in RCA: 124] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Canine mammary tumours (CMTs) are the most common neoplasms in intact female dogs. Although the prevalence of these tumours decreases in regions where preventive ovari(ohyster)ectomy is performed, it remains an important disease entity in veterinary medicine. Moreover, treatment options are limited in comparison with human breast cancer. Nevertheless, recent human treatment protocols might have potential in bitches suffering from CMTs.
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Affiliation(s)
- N Sleeckx
- Department of Veterinary Sciences, University of Antwerp, Antwerp, Belgium
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15
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Lawrence JA, Forrest LJ, Turek MM, Miller PE, Mackie TR, Jaradat HA, Vail DM, Dubielzig RR, Chappell R, Mehta MP. Proof of principle of ocular sparing in dogs with sinonasal tumors treated with intensity-modulated radiation therapy. Vet Radiol Ultrasound 2010; 51:561-570. [PMID: 20973393 PMCID: PMC2966034 DOI: 10.1111/j.1740-8261.2010.01695.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2024] Open
Abstract
Intensity-modulated radiation therapy (IMRT) allows optimization of radiation dose delivery to complex tumor volumes with rapid dose drop-off to surrounding normal tissues. A prospective study was performed to evaluate the concept of conformal avoidance using IMRT in canine sinonasal cancer. The potential of IMRT to improve clinical outcome with respect to acute and late ocular toxicity was evaluated. Thirty-one dogs with sinonasal cancer were treated definitively with IMRT using helical tomotherapy and/or dynamic multileaf collimator (DMLC) delivery. Ocular toxicity was evaluated prospectively and compared with a comparable group of historical controls treated with conventional two-dimensional radiotherapy (2D-RT) techniques. Treatment plans were devised for each dog using helical tomotherapy and DMLC that achieved the target dose to the planning treatment volume and limited critical normal tissues to the prescribed dose-volume constraints. Overall acute and late toxicities were limited and minor, detectable by an experienced observer. This was in contrast to the profound ocular morbidity observed in the historical control group treated with 2D-RT. Overall median survival for IMRT-treated and 2D-treated dogs was 420 and 411 days, respectively. Compared with conventional techniques, IMRT reduced dose delivered to eyes and resulted in bilateral ocular sparing in the dogs reported herein. These data provide proof-of-principle that conformal avoidance radiotherapy can be delivered through high conformity IMRT, resulting in decreased normal tissue toxicity as compared with historical controls treated with 2D-RT.
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Affiliation(s)
- Jessica A. Lawrence
- The School of Veterinary Medicine Department of Medical Sciences, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Lisa J. Forrest
- The School of Veterinary Medicine Department of Surgical Sciences, and University of Wisconsin-Madison, Madison, WI, 53706, USA
- Paul P. Carbone Comprehensive Cancer Center, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Michelle M. Turek
- The School of Veterinary Medicine Department of Surgical Sciences, and University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Paul E. Miller
- The School of Veterinary Medicine Department of Surgical Sciences, and University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - T. Rockwell Mackie
- Paul P. Carbone Comprehensive Cancer Center, University of Wisconsin-Madison, Madison, WI, 53706, USA
- Department of Medical Physics, University of Wisconsin-Madison, Madison, WI, 53706, USA
- Department of Human Oncology, University of Wisconsin-Madison, Madison, WI, 53706, USA
- TomoTherapy Inc., Madison, WI 53717
| | - Hazim A. Jaradat
- Department of Medical Physics, University of Wisconsin-Madison, Madison, WI, 53706, USA
- Department of Human Oncology, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - David M. Vail
- The School of Veterinary Medicine Department of Medical Sciences, University of Wisconsin-Madison, Madison, WI, 53706, USA
- Paul P. Carbone Comprehensive Cancer Center, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Richard R. Dubielzig
- The School of Veterinary Medicine Department of Pathobiological Sciences, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Richard Chappell
- Paul P. Carbone Comprehensive Cancer Center, University of Wisconsin-Madison, Madison, WI, 53706, USA
- Department of Human Oncology, University of Wisconsin-Madison, Madison, WI, 53706, USA
- Department of Biostatistics and Medical Informatics, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Minesh P. Mehta
- Paul P. Carbone Comprehensive Cancer Center, University of Wisconsin-Madison, Madison, WI, 53706, USA
- Department of Human Oncology, University of Wisconsin-Madison, Madison, WI, 53706, USA
- TomoTherapy Inc., Madison, WI 53717
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