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Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists | Page 2

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https://read.qxmd.com/read/30929978/feasibility-of-spine-stereotactic-body-radiotherapy-for-patients-with-large-tumors-in-multiple-vertebrae-undergoing-re-irradiation-dosimetric-challenge-using-3-different-beam-delivery-techniques
#21
Tomohisa Furuya, Jun H Phua, Kei Ito, Katsuyuki Karasawa
The objective of the present study was to report whether the adequate spine stereotactic body radiotherapy (SBRT) plans were generated with feasible treatment duration for patients with large vertebral metastases undergoing re-irradiation. For 5 cases, the re-irradiation plans using static-field intensity-modulated radiation therapy (SIMRT), volumetric-modulated arc therapy (VMAT), and CyberKnife with a total prescribed dose (PD) of 24 Gy applied in 2 fractions were generated. A minimum dose to 95% of the evaluated planning target volume (PTVevl ) that was >70% of PD (D95 > 70% PD) was defined as minimum criterion...
March 28, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30928177/dosimetric-comparison-of-intensity-modulated-radiation-therapy-for-early-stage-glottic-cancers-with-and-without-the-air-cavity-in-the-planning-target-volume
#22
David Asher, William Amestoy, Matthew T Studenski, Stuart E Samuels, Matthew C Abramowitz, Laura M Freedman, Nagy Elsayyad, Michael A Samuels
For early-stage glottic cancers, intensity-modulated radiation therapy (IMRT) has been shown to have comparable local control to 3D-conformal radiotherapy with the advantage of decreased dose to the carotid arteries. The planning target volume (PTV) for early glottic cancers typically includes the entire larynx, plus a 3 to 5 mm uniform margin. The air cavity within the larynx creates a challenge for the inverse optimization process as the software attempts to "build up" dose within the air. This unnecessary attempt at dose build-up in air can lead to hot spots within the rest of the PTV and surrounding soft tissue...
March 27, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30871864/evaluation-of-the-effectiveness-of-novel-single-intervention-adaptive-radiotherapy-strategies-based-on-daily-dose-accumulation
#23
Alberto Ciarmatori, Nicola Maffei, Grazia Maria Mistretta, Paola Ceroni, Annalisa Bernabei, Bruno Meduri, Elisa D'Angelo, Alessio Bruni, Patrizia Giacobazzi, Frank Lohr, Gabriele Guidi
Parotid gland (PG) shrinkage and neck volume reduction during radiotherapy of head and neck (H&N) cancer patients is a clinical issue that has prompted interest in adaptive radiotherapy (ART). This study focuses on the difference between planned dose and delivered dose and the possible effects of an efficient replanning strategy during the course of treatment. Six patients with H&N cancer treated by tomotherapy were retrospectively enrolled. Thirty daily dose distributions (DMVCT ) were calculated on pretreatment megavoltage computed tomography (MVCT) scans...
March 12, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30871863/individual-field-simultaneous-optimization-ifso-in-spot-scanning-proton-therapy-of-head-and-neck-cancers
#24
Aman Anand, Martin Bues, Mauricio E Gamez, Corbin Stefan, Samir H Patel
In order to better spare organs at risk in the head and neck, the application of proton beam therapy is of great interest. In this study we report the clinical utilization of a novel and robust scanning proton beam therapy treatment planning method called Individual Field Simultaneous Optimization (IFSO) that incorporates the advantages of field patching technique integrated with simultaneous optimization of multiple fields. A treatment planning intercomparison between a conventional Intensity Modulated Proton Therapy Treatment Plan with single target volume vs a split target volume utilizing IFSO method demonstrates superiority of IFSO with regards to sparing of organs at risk and plan robustness...
March 12, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30857654/image-guidance-technique-comparison-on-respiratory-reproducibility-and-dose-indexes-for-stereotactic-body-radiotherapy-in-lung-tumor
#25
Ryuji Kanzaki, Fujio Araki, Shinji Kawamura
We investigated respiratory reproducibility from position errors of gold internal fiducial markers for breath-hold (BH) and real-time tumor tracking (RTT) techniques for stereotactic body radiotherapy in lung tumors. The relationship between position errors and dose indexes was checked for both techniques. The stereotactic body radiotherapy plan in lung tumors was planned for 29 patients. The tumor positioning was arranged using 1.5 mm diameter gold internal fiducial markers. First, CT images were acquired to analyze position errors of gold markers for BH and RTT techniques...
March 8, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30852064/evaluation-of-the-use-of-abdominal-compression-of-the-lung-in-stereotactic-radiation-therapy
#26
Saba Javadi, Jacob Eckstein, Vincent Ulizio, Russell Palm, Krishna Reddy, David Pearson
The goal of this retrospective study was to determine the benefit in using abdominal compression to reduce tumor motion for patients treated with lung stereotactic body radiotherapy. Forty-four lung lesions (n = 44) from 37 patients (N = 37) treated at the University of Toledo's Dana Cancer Center were assessed by determining the overall tumor displacement along with possible surrogates such as change in tidal volume and diaphragm displacement, with and without abdominal compression. Measurements of lung capacity were acquired from the 4DCT at maximum and minimum respiration in order to determine the tidal volume, with and without abdominal compression...
March 6, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30846216/radiation-dose-in-the-uterine-perforation-by-tandem-in-3-dimensional-cervical-cancer-brachytherapy
#27
Yu-Lun Tsai, Pei-Chieh Yu, Hsin-Hua Nien, Shih-Yu Sung, Yi-Hsuan Kuan, Ching-Jung Wu
Cervical cancer patients may sometimes experience different types of uterine perforation by a tandem during brachytherapy. The purpose of this study was to address possibly different management strategies regarding different tandem positions from a dosimetry aspect by evaluating radiation doses delivered to organs-at-risk (OAR) in order to help medical professionals handle different types of uterine perforation. Images and dosimetry data in cervical cancer brachytherapy with uterine perforation were reviewed...
March 4, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30833115/use-of-electronic-portal-images-to-evaluate-setup-error-and-intrafraction-motion-during-free-breathing-breast-imrt-treatment-common-mistake-in-reliability-analysis
#28
LETTER
Seyyed Mohammad Tabatabaei, Meisam Shahsavari
No abstract text is available yet for this article.
March 1, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30827765/automated-noncoplanar-treatment-planning-strategy-in-stereotactic-radiosurgery-of-multiple-cranial-metastases-hyperarc-and-cyberknife-dose-distributions
#29
Noriyuki Kadoya, Yoshitomo Abe, Tomohiro Kajikawa, Kengo Ito, Takaya Yamamoto, Rei Umezawa, Takahito Chiba, Yoshiyuki Katsuta, Yoshiki Takayama, Takahiro Kato, Yasuhiro Kikuchi, Keiichi Jingu
The purpose of this study was to evaluate and compare the dosimetric effects of HyperArc-based stereotactic radiosurgery (SRS) and a robotic radiosurgery system-based planning using CyberKnife for multiple cranial metastases. In total, 11 cancer patients with multiple cranial metastases (3 to 5 tumors) treated with CyberKnife were examined. These patients were replanned using HyperArc (Varian Medical Systems, Palo Alto, USA). HyperArc plan were designed using 4 noncoplanar arc single-isocenter VMAT in 6 MV flattening filter free mode for simulated delivery with the True beam STx (Varian)...
February 28, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30799146/performance-evaluation-of-the-x-sight-spine-tracking-system-for-abdominal-tumors-distal-to-spine-a-2d-dosimetric-analysis
#30
Selami Eken, Faruk Zorlu, Mete Yeginer, Gokhan Ozyigit
The X-sight spine tracking system was integrated with Cyberknife unit to deliver radiosurgery treatments for spinal tumors without fiducial placement. However the tracking system can also be used for the treatment of abdominal tumors located in a certain distance from the spine. The aim of our study is to evaluate the tracking performance of the X-sight spine system for abdominal tumors distal to spine based on the 3 factors: tumor distance from the reference vertebra, the angle of tumor with the vertebra, and the amplitude of tumor motion due to respiration...
February 21, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30738651/monte-carlo-dose-verification-for-a-single-isocenter-vmat-plan-in-multiple-brain-metastases
#31
Kento Hoshida, Fujio Araki, Takeshi Ohno, Hirofumi Tominaga, Kazuki Komatsu, Kentaro Tamura
The purpose of this study was to verify the accuracy of dose calculation algorithms of a treatment planning system for a single-isocenter volumetric modulated arc therapy (VMAT) plan in multiple brain metastases, by comparing the dose distributions of treatment planning system with those of Monte Carlo (MC) simulations. We used a multitarget phantom containing 9 acrylic balls with a diameter of 15.9 mm inside a Lucy phantom measuring 17 × 17 × 17 cm3 . Seven VMAT plans were created using the multitarget phantom: 1 multitarget plan (MTP) and 6 single target plans (STP)...
February 6, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30713000/dose-evaluation-of-mri-based-synthetic-ct-generated-using-a-machine-learning-method-for-prostate-cancer-radiotherapy
#32
Ghazal Shafai-Erfani, Tonghe Wang, Yang Lei, Sibo Tian, Pretesh Patel, Ashesh B Jani, Walter J Curran, Tian Liu, Xiaofeng Yang
Magnetic resonance imaging (MRI)-only radiotherapy treatment planning is attractive since MRI provides superior soft tissue contrast over computed tomographies (CTs), without the ionizing radiation exposure. However, it requires the generation of a synthetic CT (SCT) from MRIs for patient setup and dose calculation. In this study, we aim to investigate the accuracy of dose calculation in prostate cancer radiotherapy using SCTs generated from MRIs using our learning-based method. We retrospectively investigated a total of 17 treatment plans from 10 patients, each having both planning CTs (pCT) and MRIs acquired before treatment...
January 31, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30655170/end-to-end-testing-of-automatic-plan-optimization-using-raystation-scripting-for-hypofractionated-multimetastatic-brain-stereotactic-radiosurgery
#33
Eun Young Han, Gwe-Ya Kim, Neal Rebueno, Debra N Yeboa, Tina M Briere
For external beam stereotactic radiosurgery of multiple brain metastatic lesions, it is difficult to select optimal treatment isocenters because the orientation and volume of each planning target volume (PTV) and its proximity to critical structures are unique for each patient. The RayStation treatment planning system offers Python-based scripting to optimize the placement of the treatment isocenter by comparing scenario-based plans. This can improve the plan quality by reducing the dose to the normal brain and increasing planning efficiency...
January 14, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30642696/evaluation-of-the-correlation-between-prostatic-displacement-and-rectal-deformation-using-the-dice-similarity-coefficient-of-the-rectum
#34
Yoshinori Tanabe, Takayuki Ishida, Hidetoshi Eto, Tatsuhiro Sera, Yuki Emoto
To estimate the relationship between the three-dimensional (3D) displacement error of the prostate and rectal deformation for reduction of deviation between the planned and treatment dose, using multiple acquisition planning CT (MPCT) and the Dice similarity coefficient (DSC) for rectal deformation for treatment of patients with prostate cancer. The 3D displacement error between the pelvic bone and a matching fiducial marker was calculated using MPCT in 24 patients who underwent prostate volumetric-modulated arc therapy for prostate cancer...
January 11, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30639142/dosimetric-comparison-of-helical-tomotherapy-and-vmat-for-anal-cancer-a-single-institutional-experience
#35
Ian Gleeson, Christopher Rose, Joshua Spurrell
To compare the dosimetric results of helical tomotherapy (HT) and volumetric arc therapy (VMAT) in the treatment of anal cancer. Plans were created for 20 (n = 20) patients treated for anal cancer using HT and 2 arc VMAT. Dosimetric comparison was assessed for doses to targets and organs at risk (small bowel, bladder, external genitalia, and femoral heads). Delivery time and dosimetric verification results were also compared. HT showed a higher V95% for both primary and nodal targets (V95% increase by 0...
January 11, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30630654/feasibility-study-of-using-flattening-filter-free-photon-beams-to-deliver-conventional-flat-beams
#36
Nicholas J Potter, Sharon Lebron, Jonathan G Li, Chihray Liu, Bo Lu
Various dosimetric benefits such as increased dose rate, and reduced leakage and out of field dose have led to the growth of flattening-filter-free (FFF) technology in the clinic. In this study, we concentrate on investigating the feasibility of using FFF beams to deliver conventional flat beams, since completely getting rid of the flattening-filter module from the gantry head can not only simplify the gantry design but also decrease the workload on machine maintenance and quality assurance. Two intensity modulated radiotherapy techniques, step-and-shoot (S&S) and sliding window (SW), were used to generate flat beam profiles for 6 regular-shaped beams and 3 clinical beams while operating in FFF mode...
January 7, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30611624/usefulness-of-ezfluence-software-for-radiotherapy-planning-of-breast-cancer-treatment
#37
Todd Yoder, An Ting Hsia, Zhigang Xu, Alexander Stessin, Samuel Ryu
This study compared the EZFluence planning technique for irradiation of the breast with commonly used Field-in-Field (FiF) technique by analyzing the dose uniformity, the dose to the lung, heart, and other organs at risk, the total Monitor Unit (MU), and the time spent for planning. Two different 3-dimensional conformal dose plans were created for 20 breast cancer patients. Six patients were treated to a dose of 5000 cGy in 25 fractions and 14 were treated to a dose of 4256 cGy in 16 fractions. Average breast volume was 800 cc (range 128 to 1892 cc)...
January 2, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30598391/appropriate-treatment-planning-method-for-field-joint-dose-in-total-body-irradiation-using-helical-tomotherapy
#38
Keisuke Usui, Akira Isobe, Naoya Hara, Naoto Shikama, Keisuke Sasai, Koichi Ogawa
Total body irradiation (TBI) using helical tomotherapy (HT) has advantages over the standard linear accelerator-based approach to the conditioning regimen for hematopoietic cell transplantation. However, the radiation field has to be divided into two independent irradiation plans to deliver a homogeneous dose to the whole body. A clinical target volume near the skin increases the skin surface dose; therefore, high- or low-dose regions arise depending on the set-up position accuracy because the two radiation fields are somewhat overlapped or separated...
December 28, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30551844/dosimetric-comparison-of-vaginal-vault-brachytherapy-vs-applicator-guided-stereotactic-body-radiotherapy-with-volumetric-modulated-arc-therapy-and-helical-tomotherapy-for-endometrium-cancer-patients
#39
Berna Akkus Yildirim, Yemliha Dolek, Ozan Cem Guler, Gungor Arslan, Cem Onal
We performed this dosimetric study to compare a nonstandard volumetric modulated arc therapy (VMAT) and helical tomotherapy (HT) techniques with high-dose rate (HDR) brachytherapy (BRT) plan of vaginal vault in patients with postoperative endometrial cancer (EC). Twelve postoperative patients with early stage EC were included in this study. Three plans were performed for each patient; dosimetric and radiobiological comparisons were made using dose-volume histograms and equivalent dose for determining the planning target volume (PTV) coverages in brachytherapy and external beam radiotherapy, and organs-at-risk (OARs) doses between three different delivery techniques...
December 11, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30527834/a-statistics-based-model-for-prediction-of-achievability-of-the-planning-criteria-for-imrt-planning
#40
King Hang Wicger Wong, Hing Tong Lucullus Leung, Lai Wan Dora Kwong
The purpose of this study is to develop and evaluate a statistics-based model to predict the achievability of the planning criteria for intensity-modulated radiation therapy planning. A statistics-based model was proposed to predict the achievability of the planning criteria based on the structure set. A retrospective study was performed to validate the proposed model. A total of 160 prostate cases and 134 nasopharynx (NP) cases were used as the training set to build the model while 200 cases for each treatment site were used to validate the proposed model...
December 5, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
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