keyword
MENU ▼
Read by QxMD icon Read
search

igrt

keyword
https://www.readbyqxmd.com/read/27931840/quality-indicators-in-the-intensity-modulated-image-guided-radiotherapy-era
#1
REVIEW
P Gabriele, A Maggio, E Garibaldi, C Bracco, E Delmastro, D Gabriele, A Rosi, F Munoz, N Di Muzio, R Corvò, M Stasi
PURPOSE: To propose new Quality Indicators (QIs) for the Intensity Modulated(IMRT)/Image-Guided(IGRT) Radiotherapy techniques. MATERIALS AND METHODS: Two structure, 10 process and 2 outcome QIs were elaborated. A working group including Radiation Oncologist, Medical Physicist and Radiation Technologists was made up. A preliminary set of indicators was selected on the basis of evidenced critical issues; the criteria to identify more relevant and specific QIs for IMRT/IGRT were defined; structure, process and outcome QIs were defined...
December 2016: Critical Reviews in Oncology/hematology
https://www.readbyqxmd.com/read/27929485/difference-in-performance-between-3d-and-4d-cbct-for-lung-imaging-a-dose-and-image-quality-analysis
#2
Sheeba Thengumpallil, Kathleen Smith, Pascal Monnin, Jean Bourhis, François Bochud, Raphaël Moeckli
The study was to describe and to compare the performance of 3D and 4D CBCT imaging modalities by measuring and analyzing the delivered dose and the image quality. The 3D (Chest) and 4D (Symmetry) CBCT Elekta XVI lung IGRT protocols were analyzed. Dose profiles were measured with TLDs inside a dedicated phantom. The dosimetric indicator cone-beam dose index (CBDI) was evaluated. The image quality analysis was performed by assessing the contrast transfer function (CTF), the noise power spectrum (NPS) and the noise-equivalent quanta (NEQ)...
November 8, 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/27908161/technical-note-magnetic-field-effects-on-gafchromic-film-response-in-mr-igrt
#3
Francisco J Reynoso, Austen Curcuru, Olga Green, Sasa Mutic, Indra J Das, Lakshmi Santanam
PURPOSE: Magnetokinetic changes may affect crystal orientation and polymerization within the active layer of radiochromic film (RCF). This effect is investigated in a magnetic resonance image-guided radiotherapy unit within the context of film dosimetry. METHODS: Gafchromic EBT2 RCF was irradiated in a 30 × 30 × 30 cm(3) solid water phantom using a Co-60 MRI guided radiotherapy system (B = 0.35 T) under normal operating conditions, and under the exact conditions and setup without a magnetic field...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27895964/half-fan-based-intensity-weighted-region-of-interest-imaging-for-low-dose-cone-beam-ct-in-image-guided-radiation-therapy
#4
Boyeol Yoo, Kihong Son, Rizza Pua, Jinsung Kim, Alexander Solodov, Seungryong Cho
OBJECTIVES: With the increased use of computed tomography (CT) in clinics, dose reduction is the most important feature people seek when considering new CT techniques or applications. We developed an intensity-weighted region-of-interest (IWROI) imaging method in an exact half-fan geometry to reduce the imaging radiation dose to patients in cone-beam CT (CBCT) for image-guided radiation therapy (IGRT). While dose reduction is highly desirable, preserving the high-quality images of the ROI is also important for target localization in IGRT...
October 2016: Healthcare Informatics Research
https://www.readbyqxmd.com/read/27894103/an-efficient-iterative-cbct-reconstruction-approach-using-gradient-projection-sparse-reconstruction-algorithm
#5
Heui Chang Lee, Bongyong Song, Jin Sung Kim, James J Jung, H Harold Li, Sasa Mutic, Justin C Park
The purpose of this study is to develop a fast and convergence proofed CBCT reconstruction framework based on the compressed sensing theory which not only lowers the imaging dose but also is computationally practicable in the busy clinic. We simplified the original mathematical formulation of gradient projection for sparse reconstruction (GPSR) to minimize the number of forward and backward projections for line search processes at each iteration. GPSR based algorithms generally showed improved image quality over the FDK algorithm especially when only a small number of projection data were available...
November 24, 2016: Oncotarget
https://www.readbyqxmd.com/read/27863010/survey-of-image-guided-radiotherapy-use-in-australia
#6
Vikneswary Batumalai, Lois Charlotte Holloway, Shivani Kumar, Kylie Dundas, Michael Geoffrey Jameson, Shalini Kavita Vinod, Geoff P Delaney
INTRODUCTION: This study aimed to evaluate the current use of imaging technologies for planning and delivery of radiotherapy (RT) in Australia. METHODS: An online survey was emailed to all Australian RT centres in August 2015. The survey inquired about imaging practices during planning and treatment delivery processes. Participants were asked about the types of image-guided RT (IGRT) technologies and the disease sites they were used for, reasons for implementation, frequency of imaging and future plans for IGRT use in their department...
November 9, 2016: Journal of Medical Imaging and Radiation Oncology
https://www.readbyqxmd.com/read/27860454/geographical-miss-of-the-prostate-during-image-guided-radiotherapy-with-a-6-mm-posterior-expansion-margin
#7
Richard Oates, Daryl Jones, Farshad Foroudi, Suki Gill, Prabhakar Ramachandran, Michal Schneider, Michael LimJoon, Tomas Kron
INTRODUCTION: Our department commonly uses a planning target volume (PTV) expansion of 6 mm posterior and 1 cm in all other directions when treating prostate cancer patients with image-guided radiotherapy (IGRT). This study aimed to test the adequacy of this PTV expansion by assessing geographical miss of the prostate on post-treatment cone-beam CT (CBCT) and identify those at risk of geographical miss. METHODS: Twenty-two prostate cancer patients receiving IGRT with implanted fiducial markers underwent daily pre-treatment orthogonal kV imaging followed by a post-treatment CBCT for a total of 432 fractions...
November 8, 2016: Journal of Medical Radiation Sciences
https://www.readbyqxmd.com/read/27788951/magnetic-resonance-image-guided-radiation-therapy-for-external-beam-accelerated-partial-breast-irradiation-evaluation-of-delivered-dose-and-intrafractional-cavity-motion
#8
Sahaja Acharya, Benjamin W Fischer-Valuck, Thomas R Mazur, Austen Curcuru, Karl Sona, Rojano Kashani, Olga Green, Laura Ochoa, Sasa Mutic, Imran Zoberi, H Harold Li, Maria A Thomas
PURPOSE: To use magnetic resonance image guided radiation therapy (MR-IGRT) for accelerated partial-breast irradiation (APBI) to (1) determine intrafractional motion of the breast surgical cavity; and (2) assess delivered dose versus planned dose. METHODS AND MATERIALS: Thirty women with breast cancer (stages 0-I) who underwent breast-conserving surgery were enrolled in a prospective registry evaluating APBI using a 0.35-T MR-IGRT system. Clinical target volume was defined as the surgical cavity plus a 1-cm margin (excluding chest wall, pectoral muscles, and 5 mm from skin)...
November 15, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27781486/quality-of-tri-co-60-mr-igrt-treatment-plans-in-comparison-with-vmat-treatment-plans-for-spine-sabr
#9
Chang Heon Choi, So-Yeon Park, Jung-In Kim, Jin Ho Kim, Kyubo Kim, Joel Carlson, Jong Min Park
OBJECTIVES: To investigate the plan quality of tri-Co-60 intensity-modulated radiation therapy (IMRT) plans for spine stereotactic ablative radiotherapy (SABR). METHODS: A total of 20 patients with spine metastasis were retrospectively selected. For each patient, a tri-Co-60 IMRT plan and a volumetric modulated arc therapy (VMAT) plan were generated. The spinal cords were defined based on magnetic resonance images for the tri-Co-60 IMRT, while isotropic 1 mm margins were added to the spinal cords for the VMAT plans...
October 26, 2016: British Journal of Radiology
https://www.readbyqxmd.com/read/27780695/real-time-image-guided-adaptive-predictive-prostate-radiotherapy-using-rectal-diameter-as-a-predictor-of-motion
#10
R Oates, A Brown, A Tan, F Foroudi, M Lim Joon, M Schneider, A Herschtal, T Kron
AIMS: To investigate a relationship between maximum rectal diameter (MRD) on pre-treatment cone beam computed tomography (CBCT) and intra-fraction prostate motion, in the context of an adaptive image-guided radiotherapy (IGRT) method. MATERIALS AND METHODS: The MRD was measured on 2125 CBCTs from 55 retrospective patient datasets and related to prostate displacement from intra-fraction imaging. A linear regression model was developed to determine a threshold MRD associated with a high probability of small prostate displacement...
October 22, 2016: Clinical Oncology: a Journal of the Royal College of Radiologists
https://www.readbyqxmd.com/read/27765832/imaging-dose-of-human-organs-from-kv-cbct-in-image-guided-radiation-therapy
#11
Kihong Son, Jin Sung Kim, Hoyeon Lee, Seungryong Cho
This study investigates dose distribution due to kV cone-beam computed tomography (CBCT) for the patients undergoing CBCT-based image-guided radiation therapy (IGRT). The kV-CBCT provides an efficient image-guidance tool for acquiring the latest volumetric image of a patient's anatomy, and has been being routinely used in clinics for an accurate treatment setup. Imaging radiation doses resulting from six different acquisition protocols of the on-board imager (OBI) were calculated using a Geant4 Application for Tomographic Emission (GATE) Monte Carlo simulation toolkit, and the absorbed doses by various organs were analyzed for the adult and pediatric numerical XCAT phantoms in this study...
October 20, 2016: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/27747014/modern-radiotherapy-using-image-guidance-for-unresectable-non-small-cell-lung-cancer-can-improve-outcomes-in-patients-treated-with-chemoradiation-therapy
#12
Matthew P Deek, Sinae Kim, Ning Yue, Rekha Baby, Inaya Ahmed, Wei Zou, John Langenfeld, Joseph Aisner, Salma K Jabbour
BACKGROUND: To investigate the impact of advances in image-guided radiotherapy (IGRT) on the outcomes of patients with non-small cell lung cancer (NSCLC) treated with chemoradiation therapy (CRT). METHODS: We retrospectively reviewed 91 patients with NSCLC treated with definitive CRT using image guidance with daily orthogonal kilovoltage (kV) imaging compared to standard weekly megavoltage (MV) portal verifications. Kaplan-Meier curves for overall survival and locoregional failure were computed and stratified by image guidance techniques...
September 2016: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/27742559/management-of-independent-motion-between-multiple-targets-in-lung-cancer-radiation-therapy
#13
Feng Liu, An Tai, Ergun Ahunbay, Elizabeth Gore, Candice Johnstone, X Allen Li
PURPOSE: To quantify interfractional independent motions between multiple primary targets in radiation therapy (RT) of lung cancer and to study the dosimetric benefits of an online adaptive replanning method to account for these variations. METHODS AND MATERIALS: Ninety-five on-treatment diagnostic-quality computed tomography (CT) scans acquired for 9 lung cancer patients treated with image-guided RT (IGRT) using a CT-on-rails (CTVision, Siemens) were analyzed. On each on-treatment CT set, contours of the targets (gross tumor volume, clinical target volume, or involved nodes), and organs at risk were generated by populating the planning contours using an autosegmentation tool (ABAS, Elekta) with manual editing...
September 2, 2016: Practical Radiation Oncology
https://www.readbyqxmd.com/read/27716349/reduced-volume-sib-imrt-igrt-to-head-and-neck-cancer-in-elderly-and-frail-patients-outcome-and-toxicity
#14
Christoph Straube, Steffi U Pigorsch, Hagen Scherb, Jan J Wilkens, Henning Bier, Stephanie E Combs
BACKGROUND: Especially elderly and frail patients have a limited ability to compensate for side effects of a radical treatment of head and neck malignancies. Limiting the target volume to the macroscopic disease, without prophylactic nodal irradiation, might present a feasible approach for these patients. The present work therefore aims evaluating an IMRT/IGRT -SIB concept for safety and efficacy. METHODS: The study retrospectively enrolled 27 patients with head and neck cancers treated between 01/2012 and 05/2015...
October 6, 2016: Radiation Oncology
https://www.readbyqxmd.com/read/27702523/the-effect-of-ionotropic-gelation-residence-time-on-alginate-cross-linking-and-properties
#15
Mitulkumar A Patel, Mohamed H H AbouGhaly, Jacqueline V Schryer-Praga, Keith Chadwick
The ability to engineer biocompatible polymers with controllable properties is highly desirable. One such approach is to cross-link carbohydrate polymers using ionotropic gelation (IG). Previous studies have investigated the effect of curing time on alginate cross-linking. Herein, we discuss a novel study detailing the effect of IG residence time (IGRT) on the cross-linking of alginate with calcium ions (Ca(2+)) along with water migration (syneresis) and their subsequent impact on the pharmaceutical properties of alginate particles...
January 2, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27689398/comparative-effectiveness-of-image-guided-radiotherapy-for-non-operated-localized-esophageal-squamous-cell-carcinoma-patients-receiving-concurrent-chemoradiotherapy-a-population-based-propensity-score-matched-analysis
#16
Chia-Chin Li, Chih-Yi Chen, Chun-Ru Chien
BACKGROUND: Although concurrent chemoradiotherapy (CCRT) coupled with image-guided radiotherapy (IGRT) is associated with a theoretical benefit in non-operated localized esophageal squamous cell carcinoma (NOL-ESCC) patients, there is currently no clinical evidence to support this. RESULTS: The study population in the primary analysis comprised 866 patients who were well balanced in terms of their co-variables. The HR for mortality when group A was compared with group B was 0...
September 26, 2016: Oncotarget
https://www.readbyqxmd.com/read/27685137/comparison-of-automatic-image-registration-uncertainty-for-three-igrt-systems-using-a-male-pelvis-phantom
#17
Jeffrey Barber, Jonathan R Sykes, Lois Holloway, David I Thwaites
A series of phantom images using the CIRS Virtual Human Male Pelvis was acquired across available dose ranges for three image-guided radiotherapy (IGRT) imaging systems: Elekta XVI CBCT, Varian TrueBeam CBCT, and TomoTherapy MV CT. Each image was registered to a fan-beam CT within the XVI software 100 times with random initial offsets. The residual registration error was analyzed to assess the role of imaging hardware and reconstruction in the uncertainty of the IGRT process. Residual translation errors were similar for all systems and < 0...
2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/27679550/interdisciplinary-consensus-statement-on-indication-and-application-of-a-hydrogel-spacer-for-prostate-radiotherapy-based-on-experience-in-more-than-250-patients
#18
Arndt-Christian Müller, Johannes Mischinger, Theodor Klotz, Bernd Gagel, Gregor Habl, Gencay Hatiboglu, Michael Pinkawa
BACKGROUND: The aim of the study was to reach a consensus on indication and application of a hydrogel spacer based on multicentre experience and give new users important information to shorten the learning curve for this innovative technique. METHODS: The interdisciplinary meeting was attended by radiation oncologists and urologists, each with experience of 23 - 138 hydrogel injections (SpaceOAR®) in prostate cancer patients before dose-escalated radiotherapy. User experience was discussed and questions were defined to comprise practical information relevant for successful hydrogel injection and treatment...
September 1, 2016: Radiology and Oncology
https://www.readbyqxmd.com/read/27675693/real-time-optical-image-guided-radiation-therapy-igrt-of-breast-chest-wall-cancer
#19
S Li, C Miyamoto, K Reilly, A Padmanabhan, B Micaily
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27675683/treatment-of-gastric-malt-lymphoma-utilizing-a-magnetic-resonance-image-guided-radiation-therapy-mr-igrt-system-evaluation-of-interfractional-target-motion
#20
B W Fischer-Valuck, A Chundury, T R Mazur, O L Green, H Li, S Mutic, M A Thomas, J Huang
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
keyword
keyword
12351
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"