keyword
MENU ▼
Read by QxMD icon Read
search

igrt

keyword
https://www.readbyqxmd.com/read/28612288/magnetic-resonance-image-guidance-in-external-beam-radiation-therapy-planning-and-delivery
#1
REVIEW
Ilamurugu Arivarasan, Chandrasekaran Anuradha, Shanmuga Subramanian, Ayyalusamy Anantharaman, Velayudham Ramasubramanian
The use of magnetic resonance (MR) imaging in radiation oncology is improving dramatically. This review article discusses the necessity of image guidance and how MR finds a significant place in radiotherapy planning and delivery. The challenges to and current solutions for an in-house MR simulation, dedicated MR simulator, estimation of electron density using MR image sets and development of MR-compatible treatment planning systems are presented. This article also reviews the feasibility, advantages and limitations of MR image-guided radiation therapy (MR-IGRT) and its drive toward the integration of radiation beams with MR technology...
June 13, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28586983/igrt-for-lung-sbrt-mvct-versus-kv-cbct
#2
G Baran, T Bossenberger, J W Burmeister, P A Paximadis
No abstract text is available yet for this article.
May 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28574131/surprising-complete-response-of-intramedullary-spinal-cord-metastasis-from-breast-cancer-a-case-report-and-literature-review
#3
Dario Aiello, Rosario Mazzola, Fabiana Gregucci, Francesco Ricchetti, Niccolò Giaj Levra, Luigi Romano, Giovanni Carbognin, Matteo Salgarello, Alberto Beltramello, Filippo Alongi
PURPOSE: Intramedullary spinal cord metastases (ISCM) are considered rare but their incidence is rising. Most ISCM cases are recognized to occur in patients with stage IV lung cancer or breast cancer (BC). METHODS: We report a rare case of cervical BC-ISCM in 60-year-old woman, documented by magnetic resonance imaging and positron emission tomography-computed tomography and treated with volumetric modulated arc therapy with daily image-guided radiation therapy (VMAT/IGRT)...
May 29, 2017: Tumori
https://www.readbyqxmd.com/read/28508846/assessment-of-three-dimensional-setup-errors-in-image-guided-pelvic-radiotherapy-for-uterine-and-cervical-cancer-using-kilovoltage-cone-beam-computed-tomography-and-its-effect-on-planning-target-volume-margins
#4
Nidhi Patni, Nagarjuna Burela, Rajesh Pasricha, Jaishree Goyal, Tej Prakash Soni, T Senthil Kumar, T Natarajan
PURPOSE: To achieve the best possible therapeutic ratio using high-precision techniques (image-guided radiation therapy/volumetric modulated arc therapy [IGRT/VMAT]) of external beam radiation therapy in cases of carcinoma cervix using kilovoltage cone-beam computed tomography (kV-CBCT). MATERIALS AND METHODS: One hundred and five patients of gynecological malignancies who were treated with IGRT (IGRT/VMAT) were included in the study. CBCT was done once a week for intensity-modulated radiation therapy and daily in IGRT/VMAT...
January 2017: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28479875/evaluation-of-cone-beam-computed-tomography-image-quality-assurance-for-vero4drt-system
#5
Hideharu Miura, Shuichi Ozawa, Masahiro Hayata, Shintarou Tsuda, Tsubasa Enosaki, Kiyoshi Yamada, Yasushi Nagata
We report the characteristics of quality assurance (QA) image for Vero4DRT system with a kilo-voltage (kV) cone-beam computed tomography (CBCT) capability to perform image-guided radiation therapy (IGRT). To acquire a set of CBCT, the kV source is rotated either 215° clockwise (CW) (tube 1 from 5° to 220° and tube 2 from 275° to 130°) or counterclockwise (CCW) (tube 1 from 85° to 230° and tube 2 from 355° to 140°). Image geometry, image uniformity, high/low contrast resolutions, and contrast linearity were measured with a Catphan 504 CT phantom (The Phantom Laboratory, NY)...
May 2017: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/28466155/dosimetric-implications-of-inter-and-intrafractional-prostate-positioning-errors-during-tomotherapy-comparison-of-gold-marker-based-registrations-with-native-mvct
#6
Peter Wust, Marc Joswig, Reinhold Graf, Dirk Böhmer, Marcus Beck, Thomasz Barelkowski, Volker Budach, Pirus Ghadjar
INTRODUCTION: For high-dose radiation therapy (RT) of prostate cancer, image-guided (IGRT) and intensity-modulated RT (IMRT) approaches are standard. Less is known regarding comparisons of different IGRT techniques and the resulting residual errors, as well as regarding their influences on dose distributions. PATIENTS AND METHODS: A total of 58 patients who received tomotherapy-based RT up to 84 Gy for high-risk prostate cancer underwent IGRT based either on daily megavoltage CT (MVCT) alone (n = 43) or the additional use of gold markers (n = 15) under routine conditions...
May 2, 2017: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/28464739/magnetic-resonance-only-workflow-and-validation-of-dose-calculations-for-radiotherapy-of-prostate-cancer
#7
Rasmus L Christiansen, Henrik R Jensen, Carsten Brink
BACKGROUND: Current state of the art radiotherapy planning of prostate cancer utilises magnetic resonance (MR) for soft tissue delineation and computed tomography (CT) to provide an electron density map for dose calculation. This dual scan workflow is prone to setup and registration error. This study evaluates the feasibility of an MR-only workflow and the validity of dose calculation from an MR derived pseudo CT. MATERIAL AND METHODS: Thirty prostate cancer patients were CT and MR scanned...
June 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28453537/an-efficient-and-robust-mri-guided-radiotherapy-planning-approach-for-targeting-abdominal-organs-and-tumours-in-the-mouse
#8
Veerle Kersemans, John S Beech, Stuart Gilchrist, Paul Kinchesh, Philip D Allen, James Thompson, Ana L Gomes, Zenobia D'Costa, Luke Bird, Iain D C Tullis, Robert G Newman, Aurelien Corroyer-Dulmont, Nadia Falzone, Abul Azad, Katherine A Vallis, Owen J Sansom, Ruth J Muschel, Borivoj Vojnovic, Mark A Hill, Emmanouil Fokas, Sean C Smart
INTRODUCTION: Preclinical CT-guided radiotherapy platforms are increasingly used but the CT images are characterized by poor soft tissue contrast. The aim of this study was to develop a robust and accurate method of MRI-guided radiotherapy (MR-IGRT) delivery to abdominal targets in the mouse. METHODS: A multimodality cradle was developed for providing subject immobilisation and its performance was evaluated. Whilst CT was still used for dose calculations, target identification was based on MRI...
2017: PloS One
https://www.readbyqxmd.com/read/28439497/study-of-recombinant-human-interleukin-12-for-treatment-of-complications-after-radiotherapy-for-tumor-patients
#9
Na Guo, Wen-Qin Wang, Xiao-Jing Gong, Lei Gao, Li-Rong Yang, Wei-Na Yu, Hong-Yu Shen, Ling-Qin Wan, Xi-Feng Jia, Yi-Shan Wang, Yi Zhao
AIM: To evaluate the treatment effects of recombinant human interleukin-12 (rhIL-12) on radiotherapy complications, such as severe myelosuppression or pancytopenia, the decline or imbalance of immune function, etc. METHODS: The patients received high-dose and short-course precise radiotherapy, such as Cyber knife and image-guided radiotherapy (IGRT), which can cause myelosuppression or pancytopenia and immune function decline within a short time. One-hundred subjects were enrolled in the study, and 50 were randomized to a treatment group which used rhIL-12 and 50 were randomized to a control group which used symptomatic and supportive therapy after radiotherapy...
April 10, 2017: World Journal of Clinical Oncology
https://www.readbyqxmd.com/read/28437010/technical-note-comparison-of-peripheral-patient-dose-from-mr-guided-60-co-therapy-and-6-mv-linear-accelerator-igrt
#10
Pascal Hauri, Roger A Hälg, Uwe Schneider
PURPOSE: The use of X-ray imaging in radiation therapy can give a substantial dose to the patient. A Cobalt machine combined with an magnetic resonance imaging (MRI) was recently introduced to clinical work. One positive aspect of using non-ionizing imaging devices is the reduction of the patient exposure. The purpose of this study was to quantify the difference in out-of-field dose to the patient between the image guided radiation therapy (IGRT) treatment applied with a linear accelerator with cone beam CT (CBCT) equipment and a Cobalt machine combined with an MRI...
April 24, 2017: Medical Physics
https://www.readbyqxmd.com/read/28434799/improved-outcomes-with-dose-escalation-in-localized-prostate-cancer-treated-with-precision-image-guided-radiotherapy
#11
Hamid Raziee, Fabio Y Moraes, Jure Murgic, Melvin L K Chua, Melania Pintilie, Peter Chung, Cynthia Ménard, Andrew Bayley, Mary Gospodarowicz, Padraig Warde, Tim Craig, Charles Catton, Robert G Bristow, David A Jaffray, Alejandro Berlin
BACKGROUND AND PURPOSE: Dose-escalated radiotherapy (DE) improves outcomes in localized prostate cancer (PCa). The impact of DE in the context of image-guided radiotherapy (IGRT) remains unknown. Herein, we determined outcomes of three sequential cohorts treated with progressive DE-IGRT. MATERIALS AND METHODS: We analyzed data from 1998 to 2012. Patients treated with radical radiotherapy were included, with three sequential institutional schedules: (A) 75.6Gy, (B) 79...
April 20, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28428474/evaluation-of-absorbed-dose-for-cbct-in-image-guided-radiation-therapy-comparison-of-each-devices-and-facilities
#12
Yumiko Kitazato, Noriyuki Kuga, Katsutoshi Shirieda, Masahiro Enzaki, Yuji Nakaguchi, Yoshinobu Shimohigashi, Toshihisa Kawasaki, Masahiko Toyoda, Daisuke Kawahara, Fujio Araki, Shinji Kawamura
Recently, intensity-modulated radiation therapy (IMRT) is used worldwide, highly accurate verification of the location using image-guided radiation therapy (IGRT) has become critical. However, the use of cone-beam computed tomography (CBCT) to ascertain the location each time raises concerns about its influence on radiotherapy dosage and increased radiation exposure. The purpose of this study was to measure the absorbed dose using nine kilovoltage (kV) devices and two megavoltage (MV) devices (total 11 devices) at eight facilities, compare the absorbed dose among the devices, and assess the characteristics of the respective devices to ensure optimal clinical operation...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28410682/integrated-digital-tomosynthesis-for-patient-positioning-of-image-guided-radiation-therapy
#13
Hui Yan, Jian-Rong Dai
PURPOSE: Digital Tomosynthesis (DTS), originally developed for diagnostic applications, has been recently introduced to image guided radiotherapy (IGRT). Due to limited scan range, DTS was featured by anisotropic spatial resolution. A new approach, integrated DTS (IDTS), was developed to improve image resolution of DTS for patient positioning in IGRT. MATERIALS AND METHODS: For registration purpose, both on-board IDTS (O-IDTS) and reference IDTS (R-IDTS) were required...
April 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28377138/daily-ct-guidance-improves-target-coverage-during-definitive-radiation-therapy-for-gastric-malt-lymphoma
#14
He Wang, Sarah A Milgrom, Bouthaina S Dabaja, Grace L Smith, Mary Martel, Chelsea C Pinnix
PURPOSE: Radiation therapy (RT) for gastric mucosa-associated lymphoid tissue (MALT) lymphoma is challenging because of variation in the stomach's position, size, and shape. We investigated the interfractional changes in stomach location, consequent dosimetric effects, and impact of daily computed tomography image guidance RT (CT-IGRT). METHODS AND MATERIALS: Twelve patients treated for gastric MALT lymphoma with intensity modulated radiation therapy, using a breath-hold technique and restriction of oral intake, were studied retrospectively...
March 6, 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/28374321/reduced-late-urinary-toxicity-with-high-dose-intensity-modulated-radiotherapy-using-intra-prostate-fiducial-markers-for-localized-prostate-cancer
#15
A Zapatero, M Roch, D Büchser, P Castro, L Fernández-Banda, G Pozo, O Liñán, C Martin de Vidales, A Cruz-Conde, F García-Vicente
BACKGROUND/PURPOSE: To evaluate the impact of intensity-modulated radiotherapy (IMRT) with intra-prostate fiducial markers image-guided radiotherapy (IGRT) on the incidence of late urinary toxicity compared to 3D conformal radiotherapy (3DCRT) for patients with prostate cancer (PC). METHODS AND MATERIALS: We selected 733 consecutive patients with localized PC treated with dose-escalation radiotherapy between 2001 and 2014. Eligibility criteria were radiation dose >72...
April 3, 2017: Clinical & Translational Oncology
https://www.readbyqxmd.com/read/28337425/post-prostatectomy-image-guided-radiotherapy-the-invisible-target-concept
#16
REVIEW
Florent Vilotte, Mickael Antoine, Maxime Bobin, Igor Latorzeff, Stéphane Supiot, Pierre Richaud, Laurence Thomas, Nicolas Leduc, Stephane Guérif, Jone Iriondo-Alberdi, Renaud de Crevoisier, Paul Sargos
In the era of intensity-modulated radiation therapy, image-guided radiotherapy (IGRT) appears crucial to control dose delivery and to promote dose escalation while allowing healthy tissue sparing. The place of IGRT following radical prostatectomy is poorly described in the literature. This review aims to highlight some key points on the different IGRT techniques applicable to prostatic bed radiotherapy. Furthermore, methods used to evaluate target motion and to reduce planning target volume margins will also be explored...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28332342/evaluation-of-the-truebeam-machine-performance-check-mpc-geometric-checks-for-daily-igrt-geometric-accuracy-quality-assurance
#17
Michael P Barnes, Peter B Greer
Machine Performance Check (MPC) is an automated and integrated image-based tool for verification of beam and geometric performance of the TrueBeam linac. The aims of the study were to evaluate the performance of the MPC geometric tests relevant to OBI/CBCT IGRT geometric accuracy. This included evaluation of the MPC isocenter and couch tests. Evaluation was performed by comparing MPC to QA tests performed routinely in the department over a 4-month period. The MPC isocenter tests were compared against an in-house developed Winston-Lutz test and the couch compared against routine mechanical QA type procedures...
March 22, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28321456/-comparison-of-combined-imrt-and-igrt-with-conventional-3d-crt-in-the-irradiation-of-prostate-cancer-studying-the-advantages-strongly-depends-on-the-conditions
#18
Norbert Hodapp
No abstract text is available yet for this article.
March 20, 2017: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/28297443/comparison-of-automatic-image-registration-uncertainty-for-three-igrt-systems-using-a-male-pelvis-phantom
#19
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...
September 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297353/comparison-of-manual-and-automatic-mr-ct-registration-for-radiotherapy-of-prostate-cancer
#20
Anne Sofie Korsager, Jesper Carl, Lasse Riis Østergaard
In image-guided radiotherapy (IGRT) of prostate cancer, delineation of the clinical target volume (CTV) often relies on magnetic resonance (MR) because of its good soft-tissue visualization. Registration of MR and computed tomography (CT) is required in order to add this accurate delineation to the dose planning CT. An automatic approach for local MR-CT registration of the prostate has previously been developed using a voxel property-based registration as an alternative to a manual landmark-based registration...
May 2016: Journal of Applied Clinical Medical 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"