keyword
MENU ▼
Read by QxMD icon Read
search

Radiation therapy planning

keyword
https://www.readbyqxmd.com/read/29666822/accuracy-and-precision-of-a-veterinary-neuronavigation-system-for-radiation-oncology-positioning
#1
Isabelle F Vanhaezebrouck, Elizabeth A Ballegeer, Stephen Frey, Rob Sieffert
Conformal radiation treatment plans such as IMRT and other radiosurgery techniques require very precise patient positioning, typically within a millimeter of error for best results. CT cone beam, real-time navigation, and infrared position sensors are potential options for success but rarely present in veterinary radiation centers. A neuronavigation system (Brainsight Vet, Rogue Research) was tested 22 times on a skull for positioning accuracy and precision analysis. The first 6 manipulations allowed the authors to become familiar with the system but were still included in the analyses...
2018: Journal of Veterinary Medicine
https://www.readbyqxmd.com/read/29665832/volumetric-and-dosimetric-comparison-of-organs-at-risk-between-the-prone-and-supine-positions-in-postoperative-radiotherapy-for-prostate-cancer
#2
Subaru Sawayanagi, Hideomi Yamashita, Mami Ogita, Tomoki Kiritoshi, Takahiro Nakamoto, Osamu Abe, Keiichi Nakagawa
BACKGROUND: The aim of this study was to evaluate the effects of patient positioning on the volume of organs at risk (OARs) in or near the planning target volume (PTV) and the dose distribution in adjuvant or salvage radiotherapy for prostate cancer after prostatectomy. METHODS: Seventeen patients who received intensity-modulated radiation therapy (66 Gy in 33 fractions) as adjuvant or salvage therapy after prostatectomy were evaluated. All patients underwent CT scans in both the prone (on a belly board) and supine positions...
April 17, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29664225/improvement-of-dose-calculation-in-radiation-therapy-due-to-metal-artifact-correction-using-the-augmented-likelihood-image-reconstruction
#3
Christian Ziemann, Maik Stille, Florian Cremers, Thorsten M Buzug, Dirk Rades
BACKGROUND: Metal artifacts caused by high-density implants lead to incorrectly reconstructed Hounsfield units in computed tomography images. This can result in a loss of accuracy in dose calculation in radiation therapy. This study investigates the potential of the metal artifact reduction algorithms, Augmented Likelihood Image Reconstruction and linear interpolation, in improving dose calculation in the presence of metal artifacts. MATERIALS AND METHODS: In order to simulate a pelvis with a double-sided total endoprosthesis, a polymethylmethacrylate phantom was equipped with two steel bars...
April 17, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29661502/unusual-occurrence-reporting-system-sharing-a-ten-years-experience-from-a-tertiary-care-jcia-accredited-university-hospital
#4
A Hussain, Y Khan, N Ali, A Q Jangda, S Siddiqui, W Muhammad, Z Khan, A N Abbasi, L Rehman, A Yousuf
PURPOSE: Identifying a true measure of safety is challenging in radiation oncology. A culture of unusual reporting may however be used as an indirect measure for it. The purpose of this study is to share our experience of unusual occurrence reporting system, established in the Radiation Oncology section since 2006, the first of this nature in Pakistan. MATERIALS AND METHODS: Data is collected over the last ten years. An in-house online reporting system has been developed for reporting unusual events...
April 13, 2018: Cancer Radiothérapie: Journal de la Société Française de Radiothérapie Oncologique
https://www.readbyqxmd.com/read/29661254/the-risk-and-predictors-for-severe-radiation-pneumonitis-in-lung-cancer-patients-treated-with-thoracic-reirradiation
#5
Chengbo Ren, Tianlong Ji, Tingting Liu, Jun Dang, Guang Li
BACKGROUND: Thoracic reirradiation (re-RT) is increasingly administered. However, radiation pneumonitis (RP) remains to be the most common side effect from retreatment. This study aimed to determine the risk and predictors for severe RP in patients receiving thoracic re-RT. METHODS: Sixty seven patients with lung cancer received thoracic re-RT for recurrent or metastatic disease. Three-dimensional conformal radiotherapy (3D-CRT)/intensity modulated radiotherapy (IMRT) was used for 60 patients, and stereotactic body radiation therapy (SBRT) was used in 7 patients...
April 16, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29651825/feasibility-of-using-optical-coherence-tomography-to-detect-acute-radiation-induced-esophageal-damage-in-small-animal-models
#6
Pouya Jelvehgaran, Daniel Martijn de Bruin, F Javier Salguero, Gerben Roelof Borst, Ji-Ying Song, Ton G van Leeuwen, Johannes F de Boer, Tanja Alderliesten, Marcel van Herk
Lung cancer survival is poor, and radiation therapy patients often suffer serious treatment side effects. The esophagus is particularly sensitive leading to acute radiation-induced esophageal damage (ARIED). We investigated the feasibility of optical coherence tomography (OCT) for minimally invasive imaging of the esophagus with high resolution (10  μm) to detect ARIED in mice. Thirty mice underwent cone-beam computed tomography imaging for initial setup assessment and dose planning followed by a single-dose delivery of 4...
April 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29650302/raystation-external-beam-treatment-planning-system
#7
Dayna Bodensteiner
RaySearch Laboratories is a world leader in the field of advanced software and creator of the RayStation treatment planning system for radiation therapy. The aim with RayStation is to deliver an unmatched user experience and leading functionality. Unique features described here include multiatlas based autosegmentation for contouring, deformable registration with 2 different algorithms, multicriteria optimization, Plan Explorer, fallback planning, ultrafast computation speed, and 4-dimensional (4D) adaptive radiation therapy...
April 9, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29628631/dosimetric-and-radiobiological-evaluation-of-patient-setup-accuracy-in-head-and-neck-radiotherapy-using-daily-computed-tomography-on-rails-based-corrections
#8
Ines-Ana Jurkovic, Esengul Kocak-Uzel, Abdallah Sherif Radwan Mohamed, Eleftherios Lavdas, Sotirios Stathakis, Nikos Papanikolaou, David C Fuller, Panayiotis Mavroidis
Introduction: This study evaluates treatment plans aiming at determining the expected impact of daily patient setup corrections on the delivered dose distribution and plan parameters in head-and-neck radiotherapy. Materials and Methods: In this study, 10 head-and-neck cancer patients are evaluated. For the evaluation of daily changes of the patient internal anatomy, image-guided radiation therapy based on computed tomography (CT)-on-rails was used. The daily-acquired CT-on-rails images were deformedly registered to the CT scan that was used during treatment planning...
January 2018: Journal of Medical Physics
https://www.readbyqxmd.com/read/29628629/comparison-of-volumetric-modulated-arc-therapy-and-intensity-modulated-radiation-therapy-for-whole-brain-hippocampal-sparing-treatment-plans-based-on-radiobiological-modeling
#9
Ethan Kendall, Ozer Algan, Salahuddin Ahmad
Introduction: In this article, we report the results of our investigation on comparison of radiobiological aspects of treatment plans with linear accelerator-based intensity-modulated radiation therapy and volumetric-modulated arc therapy for patients having hippocampal avoidance whole-brain radiation therapy. Materials and Methods: In this retrospective study using the dose-volume histogram, we calculated and compared biophysical indices of equivalent uniform dose, tumor control probability, and normal tissue complication probability (NTCP) for 15 whole-brain radiotherapy patients...
January 2018: Journal of Medical Physics
https://www.readbyqxmd.com/read/29628628/a-treatment-planning-method-for-better-management-of-radiation-induced-oral-mucositis-in-locally-advanced-head-and-neck-cancer
#10
Hao Howard Zhang, Warren D D'Souza
Purpose/Aim: To describe a two-phase intensity-modulated radiation therapy (IMRT) treatment planning approach, that is, promising for reduction of oral mucositis risk in locally advanced head-and-neck cancer. Materials and Methods: Ten locally advanced head-and-neck cancer patients who underwent RT were retrospectively collected. Conventional IMRT and volumetric-modulated arc therapy (VMAT) plans were generated for these patients following clinical protocol. Following the first phase of generating conventional IMRT plans, our approach utilized data from Monte Carlo-based kernel superposition dose calculations corresponding to beam apertures (generated from the conventional IMRT plans) and used an exact mathematical programming-based optimization approach applying linear programming (LP) to dose optimization in the second phase...
January 2018: Journal of Medical Physics
https://www.readbyqxmd.com/read/29624708/accuracy-of-electron-density-effective-atomic-number-and-iodine-concentration-determination-with-a-dual-layer-dual-energy-computed-tomography-system
#11
Chia-Ho Hua, Nadav Shapira, Thomas E Merchant, Paul Klahr, Yoad Yagil
PURPOSE: This study aimed to quantify the accuracy of the determination of electron density (ED), effective atomic number (Zeff ), and iodine concentration, directed for more accurate radiation therapy planning, with a new dual-layer dual-energy computed tomography (DL-DECT) system. The dependence of the accuracy of these values on the scan and reconstruction parameters, as well as on the phantom size, was also examined. METHODS: Measurements were performed on a commercial DECT system with a DL detector (IQon Spectral CT, Philips Healthcare), using phantoms with various tissue-equivalent inserts as well as iodine and calcium inserts of different concentrations...
April 6, 2018: Medical Physics
https://www.readbyqxmd.com/read/29624463/phase-iii-intergroup-trial-of-adjuvant-androgen-deprivation-with-or-without-mitoxantrone-plus-prednisone-in-patients-with-high-risk-prostate-cancer-after-radical-prostatectomy-swog-s9921
#12
Maha Hussain, Catherine M Tangen, Ian M Thompson, Gregory P Swanson, David P Wood, Wael Sakr, Nancy A Dawson, Naomi B Haas, Thomas W Flaig, Tanya B Dorff, Daniel W Lin, E David Crawford, David I Quinn, Nicholas J Vogelzang, L Michael Glode
Purpose Patients with high-risk prostate cancer after radical prostatectomy are at risk for death. Adjuvant androgen-deprivation therapy (ADT) may reduce this risk. We hypothesized that the addition of mitoxantrone and prednisone (MP) to adjuvant ADT could reduce mortality compared with adjuvant ADT alone. Methods Eligible patients had cT1-3N0 prostate cancer with one or more high-risk factors after radical prostatectomy (Gleason score [GS] ≥ 8; pT3b, pT4, or pN+ disease; GS 7 and positive margins; or preoperative prostate-specific antigen [PSA] > 15 ng/mL, biopsy GS score > 7, or PSA > 10 ng/mL plus biopsy GS > 6...
April 6, 2018: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/29623584/dosimetry-study-of-18-f-fmiso-pet-ct-hypoxia-imaging-guidance-on-intensity-modulated-radiation-therapy-for-non-small-cell-lung-cancer
#13
H Li, D Xu, X Han, Q Ruan, X Zhang, Y Mi, M Dong, S Guo, Y Lin, B Wang, G Li
OBJECTIVES: This study was to evaluate the feasibility of simultaneous integrated boost on tumor hypoxia area by studying the dosimetric change of hypoxia imaging guidance on intensity-modulated radiation therapy for non-small cell lung cancer (NSCLC). METHODS: Five NSCLC patients with large hypoxic volume participated in this study. FDG PET/CT images were fused with CT localization images to delineate gross tumor volume. FMISO PET/CT images were fused with CT localization images to delineate hypoxic biological target volume (BTV) (tissue maximum ratio ≥ 1...
April 5, 2018: Clinical & Translational Oncology
https://www.readbyqxmd.com/read/29622135/how-does-mr-imaging-help-care-for-my-breast-cancer-patient-perspective-of-a-radiation-oncologist
#14
REVIEW
Kaitlin M Christopherson, Benjamin D Smith
Radiation therapy is used in many cases of both early and late breast cancer. The authors examine the role of MR imaging as it pertains to radiotherapy planning and treatment approaches for patients with breast cancer. MR imaging can assist the radiation oncologist in determining the best radiation approach and in creating treatment planning volumes. MR imaging may be useful in the setting of accelerated partial breast irradiation. Radiation oncologists should attend to MR breast images, when obtained, to ensure that these imaging findings are taken into consideration when developing a radiation therapy plan...
May 2018: Magnetic Resonance Imaging Clinics of North America
https://www.readbyqxmd.com/read/29622079/lung-cancer-posttreatment-imaging-radiation-therapy-and-imaging-findings
#15
REVIEW
Marcelo F Benveniste, James Welsh, Chitra Viswanathan, Girish S Shroff, Sonia L Betancourt Cuellar, Brett W Carter, Edith M Marom
In this review, we discuss the different radiation delivery techniques available to treat non-small cell lung cancer, typical radiologic manifestations of conventional radiotherapy, and different patterns of lung injury and temporal evolution of the newer radiotherapy techniques. More sophisticated techniques include intensity-modulated radiotherapy, stereotactic body radiotherapy, proton therapy, and respiration-correlated computed tomography or 4-dimensional computed tomography for radiotherapy planning. Knowledge of the radiation treatment plan and technique, the completion date of radiotherapy, and the temporal evolution of radiation-induced lung injury is important to identify expected manifestations of radiation-induced lung injury and differentiate them from tumor recurrence or infection...
May 2018: Radiologic Clinics of North America
https://www.readbyqxmd.com/read/29622073/lung-cancer-biopsies
#16
REVIEW
Amita Sharma, Jo-Anne O Shepard
Image-guided percutaneous transthoracic needle biopsy (PTNB) is a well-established and minimally invasive technique for evaluating pulmonary nodules. Implementation of a national lung screening program and increased use of chest computed tomography have contributed to the frequent identification of indeterminate pulmonary nodules that may require tissue sampling. The advent of biomarker-driven lung cancer therapy has led to increased use of repeat PTNB after diagnosis. Percutaneous insertion of markers for preoperative localization of small nodules can aid in minimally invasive surgery and radiation treatment planning...
May 2018: Radiologic Clinics of North America
https://www.readbyqxmd.com/read/29621872/dosimetric-comparison-of-imrt-versus-3dcrt-for-post-mastectomy-chest-wall-irradiation
#17
Kartick Rastogi, Shantanu Sharma, Shivani Gupta, Nikesh Agarwal, Sandeep Bhaskar, Sandeep Jain
PURPOSE: To compare the dose distribution of three-dimensional conformal radiation therapy (3DCRT) with intensity-modulated radiation therapy (IMRT) for post-mastectomy radiotherapy (PMRT) to left chest wall. MATERIALS AND METHODS: One hundred and seven patients were randomised for PMRT in 3DCRT group (n = 64) and IMRT group (n = 43). All patients received 50 Gy in 25 fractions. Planning target volume (PTV) parameters-Dnear-max (D2 ), Dnear-min (D98 ), Dmean , V95 , and V107 -homogeneity index (HI), and conformity index (CI) were compared...
March 2018: Radiation Oncology Journal
https://www.readbyqxmd.com/read/29621869/intensity-modulated-radiation-therapy-a-review-with-a-physics-perspective
#18
REVIEW
Byungchul Cho
Intensity-modulated radiation therapy (IMRT) has been considered the most successful development in radiation oncology since the introduction of computed tomography into treatment planning that enabled three-dimensional conformal radiotherapy in 1980s. More than three decades have passed since the concept of inverse planning was first introduced in 1982, and IMRT has become the most important and common modality in radiation therapy. This review will present developments in inverse IMRT treatment planning and IMRT delivery using multileaf collimators, along with the associated key concepts...
March 2018: Radiation Oncology Journal
https://www.readbyqxmd.com/read/29619963/national-cancer-institute-workshop-on-proton-therapy-for-children-considerations-regarding-brainstem-injury
#19
REVIEW
Daphne Haas-Kogan, Daniel Indelicato, Harald Paganetti, Natia Esiashvili, Anita Mahajan, Torunn Yock, Stella Flampouri, Shannon MacDonald, Maryam Fouladi, Kry Stephen, John Kalapurakal, Stephanie Terezakis, Hanne Kooy, David Grosshans, Mike Makrigiorgos, Kavita Mishra, Tina Young Poussaint, Kenneth Cohen, Thomas Fitzgerald, Vinai Gondi, Arthur Liu, Jeff Michalski, Dragan Mirkovic, Radhe Mohan, Stephanie Perkins, Kenneth Wong, Bhadrasain Vikram, Jeff Buchsbaum, Larry Kun
PURPOSE: Proton therapy can allow for superior avoidance of normal tissues. A widespread consensus has been reached that proton therapy should be used for patients with curable pediatric brain tumor to avoid critical central nervous system structures. Brainstem necrosis is a potentially devastating, but rare, complication of radiation. Recent reports of brainstem necrosis after proton therapy have raised concerns over the potential biological differences among radiation modalities. We have summarized findings from the National Cancer Institute Workshop on Proton Therapy for Children convened in May 2016 to examine brainstem injury...
May 1, 2018: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/29619962/a-prospective-4%C3%AF-radiation-therapy-clinical-study-in-recurrent-high-grade-glioma-patients
#20
Victoria Y Yu, Angelia Landers, Kaley Woods, Dan Nguyen, Minsong Cao, Dongsu Du, Robert K Chin, Ke Sheng, Tania B Kaprealian
PURPOSE: To evaluate the feasibility, safety, dosimetric benefits, delivery efficiency, and patient comfort in the clinical implementation of 4π radiation therapy. METHODS AND MATERIALS: Eleven patients with recurrent high-grade glioma were recruited for the trial. 4π plans integrating beam orientation and fluence-map optimization were created using an in-house column-generation algorithm. The collision-free beam solution space throughout the 4π steradian was determined using a computer-aided-design model of the Varian TrueBeam system and a human subject...
May 1, 2018: International Journal of Radiation Oncology, Biology, Physics
keyword
keyword
17737
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"