keyword
MENU ▼
Read by QxMD icon Read
search

Image Guided Radiotherapy

keyword
https://www.readbyqxmd.com/read/29667294/image-quality-and-absorbed-dose-comparison-of-single-and-dual-source-cone-beam-computed-tomography
#1
Hideharu Miura, Shuichi Ozawa, Toshiya Okazue, Atsushi Kawakubo, Kiyoshi Yamada, Yasushi Nagata
PURPOSE: Dual-source cone-beam computed tomography (DCBCT) is currently available in the Vero4DRT image-guided radiotherapy system. We evaluated the image quality and absorbed dose for DCBCT and compared the values with those for single-source CBCT (SCBCT). METHODS: Image uniformity, Hounsfield unit (HU) linearity, image contrast, and spatial resolution were evaluated using a Catphan phantom. The rotation angle for acquiring SCBCT and DCBCT images is 215° and 115°, respectively...
April 17, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29667156/how-we-manage-patients-with-plasmacytomas
#2
REVIEW
Despina Fotiou, Meletios A Dimopoulos, Efstathios Kastritis
PURPOSE OF REVIEW: To discuss the diagnostic approach, treatment options, and future considerations in the management of plasmacytomas, either solitary or in the context of overt multiple myeloma (MM). RECENT FINDINGS: Advanced imaging techniques such as whole-body magnetic resonance imaging and positron emission tomography/computerized tomography are essential for the diagnostic workup of solitary plasmacytomas (SP) to rule out the presence of other disease foci...
April 17, 2018: Current Hematologic Malignancy Reports
https://www.readbyqxmd.com/read/29664602/engineering-persistent-luminescence-nanoparticles-for-biological-applications-from-biosensing-bioimaging-to-theranostics
#3
Shao-Kai Sun, He-Fang Wang, Xiu-Ping Yan
Persistent luminescence nanoparticles (PLNPs) are unique optical materials emitting long-lasting luminescence after ceasing excitation. Such a unique optical feature allows luminescence detection without constant external illumination to avoid the interferences of autofluorescence and scattering light from biological fluids and tissues. Besides, near-infrared (NIR) PLNPs have advantages of deep penetration and the reactivation of the persistent luminescence (PL) by red or NIR light. These features make the application of NIR-emitting PLNPs in long-term bioimaging no longer limited by the lifetime of PL...
April 17, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29663429/remote-cherenkov-imaging-based-quality-assurance-of-a-magnetic-resonance-image-guided-radiotherapy-system
#4
Jacqueline M Andreozzi, Karen E Mooney, Petr Brůža, Austen Curcuru, David J Gladstone, Brian W Pogue, Olga Green
PURPOSE: Tools to perform regular quality assurance of magnetic resonance image-guided radiotherapy (MR-IGRT) systems should ideally be independent of interference from the magnetic fields. Remotely acquired optical Cherenkov imaging-based dosimetry measurements in water were investigated for this purpose, comparing measures of dose accuracy, temporal dynamics, and overall integrated IMRT delivery. METHODS: A 40x30.5x37.5cm3 water tank doped with 1g/L of quinine sulfate was imaged using an intensified charge coupled device (ICCD) to capture the Cherenkov emission while being irradiated by a commercial MR-IGRT system (ViewRay™ )...
April 16, 2018: Medical Physics
https://www.readbyqxmd.com/read/29663419/accelerated-3d-bssfp-imaging-for-treatment-planning-on-an-mri-guided-radiotherapy-system
#5
Yu Gao, Ziwu Zhou, Fei Han, Minsong Cao, Narek Shaverdian, John V Hegde, Biraj B Bista, Michael Steinberg, Percy Lee, Ann Raldow, Daniel A Low, Yingli Yang, Peng Hu
PURPOSE: To introduce a compressed sensing and parallel imaging combined technique to reduce the acquisition time of planning MRI for MR-guided radiotherapy (MRgRT) systems. METHODS AND MATERIALS: A variable-density Poisson-Disk (VDPD) under-sampling acquisition along with compressed sensing reconstruction technique was developed and compared with the current planning MR protocol, which uses an optimized balanced-steady-state-free-precession sequence with 7.5-fold (7...
April 16, 2018: Medical Physics
https://www.readbyqxmd.com/read/29663412/an-efficient-model-to-guide-prospective-t2-weighted-4d-magnetic-resonance-imaging-acquisition
#6
Dongsu Du, Sasa Mutic, H Harold Li, Yanle Hu
PURPOSE: To establish a mathematical model to guide prospective T2 weighted 4-dimensional magnetic resonance imaging (4DMRI) acquisition and to propose an efficient solution to expedite prospective T2 weighted 4DMRI acquisition. METHODS: Prospective T2 weighted 4DMRI acquisition was characterized by a mathematical model with 4DMRI acquisition time as the objective function and completeness of the image set, acquisition timing, image contrast, and image artifacts as the constraints...
April 16, 2018: Medical Physics
https://www.readbyqxmd.com/read/29660918/contrast-enhanced-ultrasound-ceus-with-mri-image-fusion-for-monitoring-focal-therapy-of-prostate-cancer-with-high-intensity-focused-ultrasound-hifu-1
#7
M Apfelbeck, D-A Clevert, J Ricke, C Stief, B Schlenker
INTRODUCTION: Reduced acceptance of radical prostatectomy in patients with low risk or intermediate risk prostate cancer has significantly changed treatment strategies in prostate cancer (PCa) during the last years. Focal therapy of the prostate with high intensity focused ultrasound (HIFU) is an organ-preserving treatment for prostate cancer with less impairment of health-related quality of life. Follow-up after HIFU therapy by imaging modalities remains a major problem as eg. MRI performs poorly...
April 7, 2018: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/29655582/comparison-of-3-image-guided-adaptive-strategies-for-bladder-locoregional-radiotherapy
#8
Vickie C Kong, Amy Taylor, Peter Chung, Tim Craig, Tara Rosewall
The objective of this study was to compare the dosimetric differences of a population-based planning target volume (PTV) approach and 3 proposed adaptive strategies: plan of the day (POD), patient-specific PTV (PS-PTV), and daily reoptimization (ReOpt). Bladder patients (n = 10) were planned and treated to 46 Gy in 23 fractions with a full bladder in supine position by the standard strategy using a population-based PTV. For each patient, the adaptive strategy was executed retrospectively as follows: (1) POD-multiple distributions of various PTV sizes were generated, and the appropriate distribution based on the bladder of the day was selected for each fraction; (2) PS-PTV-population-based PTV was used for the first 5 fractions and a new PTV derived using information from these fractions was used to deliver the remaining 18 fractions; and (3) ReOpt-distribution was reoptimized for each fraction based on the bladder of the day...
April 11, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29652178/multi-modal-imaging-for-dose-planning-and-its-benefits-the-paradigm-of-head-and-neck-tumours
#9
V Grégoire
The ultimate goal of any radiotherapy is to eradicate the disease without inflicting damage on the normal tissues surrounding the tumours, which could be responsible for late treatment morbidity. To achieve this objective, the first step is to precisely select and delineate the target volumes to which a given dose will be prescribed. This step requires the use of multi-modal images from clinical examination to anatomical and molecular images. Imaging examination will be used not only to delineate the boundaries of the tumour volume, but also to assess tumour heterogeneity and, possibly, to guide a heterogeneous dose prescription (i...
January 1, 2018: Annals of the ICRP
https://www.readbyqxmd.com/read/29651368/synchronous-pulmonary-neoplasms-a-chance-occurrence-or-is-there-more-than-meets-the-eye
#10
Uroosa Ibrahim, Amina Saqib, Manisha Pant, Gwenalyn Garcia, Marcel Odaimi
Primary bronchus-associated lymphoid tissue (BALT) lymphoma comprises 5% of non-Hodgkin's lymphoma (NHL) and usually has an indolent course. Synchronous primary lung cancers with BALT lymphoma are seldom seen in patients with adenocarcinoma of the lung. Synchronous squamous cell carcinoma (SCC) and BALT lymphoma is an extremely rare occurrence. We report an unusual case of stage 4 BALT lymphoma requiring treatment that revealed an underlying ipsilateral mass causing a diagnostic dilemma. An 84-year-old female with a history of systemic lupus erythematosus, deep vein thrombosis, and thrombotic microangiopathy presented to the hospital with cough and dyspnea on exertion...
February 6, 2018: Curēus
https://www.readbyqxmd.com/read/29650035/image-guided-radiotherapy-reduces-the-risk-of-under-dosing-high-risk-prostate-cancer-extra-capsular-disease-and-improves-biochemical-control
#11
Per Munck Af Rosenschold, Michael J Zelefsky, Aditya P Apte, Andrew Jackson, Jung Hun Oh, Elliot Shulman, Neil Desai, Margie Hunt, Pirus Ghadjar, Ellen Yorke, Joseph O Deasy
BACKGROUND: To determine if reduced dose delivery uncertainty is associated with daily image-guidance (IG) and Prostate Specific Antigen Relapse Free Survival (PRFS) in intensity-modulated radiotherapy (IMRT) of high-risk prostate cancer (PCa). METHODS: Planning data for consecutive PCa patients treated with IMRT (n = 67) and IG-IMRT (n = 35) was retrieved. Using computer simulations of setup errors, we estimated the patient-specific uncertainty in accumulated treatment dose distributions for the prostate and for posterolateral aspects of the gland that are at highest risk for extra-capsular disease...
April 12, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29649281/classification-for-long-term-survival-in-oligometastatic-patients-treated-with-ablative-radiotherapy-a-multi-institutional-pooled-analysis
#12
Julian C Hong, Diandra N Ayala-Peacock, Jason Lee, A William Blackstock, Paul Okunieff, Max W Sung, Ralph R Weichselbaum, Johnny Kao, James J Urbanic, Michael T Milano, Steven J Chmura, Joseph K Salama
BACKGROUND: Radiotherapy is increasingly used to treat oligometastatic patients. We sought to identify prognostic criteria in oligometastatic patients undergoing definitive hypofractionated image-guided radiotherapy (HIGRT). METHODS: Exclusively extracranial oligometastatic patients treated with HIGRT were pooled. Characteristics including age, sex, primary tumor type, interval to metastatic diagnosis, number of treated metastases and organs, metastatic site, prior systemic therapy for primary tumor treatment, prior definitive metastasis-directed therapy, and systemic therapy for metastasis associated with overall survival (OS), progression-free survival (PFS), and treated metastasis control (TMC) were assessed by the Cox proportional hazards method...
2018: PloS One
https://www.readbyqxmd.com/read/29645076/the-role-of-external-beam-radiotherapy-in-the-treatment-of-hepatocellular-cancer
#13
REVIEW
Fumiko Chino, Sarah Jo Stephens, Steve S Choi, Daniele Marin, Charles Y Kim, Michael A Morse, Devon J Godfrey, Brian G Czito, Christopher G Willett, Manisha Palta
Hepatocellular carcinoma (HCC) is increasing in incidence and mortality. Although the prognosis remains poor, long-term survival has improved from 3% in 1970 to an 18% 5-year survival rate today. This is likely because of the introduction of well tolerated, oral antiviral therapies for hepatitis C. Curative options for patients with HCC are often limited by underlying liver dysfunction/cirrhosis and medical comorbidities. Less than one-third of patients are candidates for surgery, which is the current gold standard for cure...
April 12, 2018: Cancer
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
#14
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/29628292/functional-guided-radiotherapy-using-knowledge-based-planning
#15
Austin M Faught, Lindsey Olsen, Leah Schubert, Chad Rusthoven, Edward Castillo, Richard Castillo, Jingjing Zhang, Thomas Guerrero, Moyed Miften, Yevgeniy Vinogradskiy
BACKGROUND AND PURPOSE: There are two significant challenges when implementing functional-guided radiotherapy using 4DCT-ventilation imaging: (1) lack of knowledge of realistic patient specific dosimetric goals for functional lung and (2) ensuring consistent plan quality across multiple planners. Knowledge-based planning (KBP) is positioned to address both concerns. MATERIAL AND METHODS: A KBP model was created from 30 previously planned functional-guided lung patients...
April 5, 2018: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29624151/histopathological-features-predictive-of-local-control-of-atypical-meningioma-after-surgery-and-adjuvant-radiotherapy
#16
William C Chen, Stephen T Magill, Ashley Wu, Harish N Vasudevan, Olivier Morin, Manish K Aghi, Philip V Theodosopoulos, Arie Perry, Michael W McDermott, Penny K Sneed, Steve E Braunstein, David R Raleigh
OBJECTIVE The goal of this study was to investigate the impact of adjuvant radiotherapy (RT) on local recurrence and overall survival in patients undergoing primary resection of atypical meningioma, and to identify predictive factors to inform patient selection for adjuvant RT. METHODS One hundred eighty-two patients who underwent primary resection of atypical meningioma at a single institution between 1993 and 2014 were retrospectively identified. Patient, meningioma, and treatment data were extracted from the medical record and compared using the Kaplan-Meier method, log-rank tests, multivariate analysis (MVA) Cox proportional hazards models with relative risk (RR), and recursive partitioning analysis...
April 6, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29623466/is-tumor-volume-reduction-during-radiotherapy-prognostic-relevant-in-patients-with-stage-iii-non-small-cell-lung-cancer
#17
Khaled Elsayad, Laith Samhouri, Sergiu Scobioala, Uwe Haverkamp, Hans Theodor Eich
PURPOSE/OBJECTIVE(S): Lung cancer tumor volume reduction is common during radiation treatment (RT). The purpose of this study was to investigate tumor volume reduction ratio (VRR) and its correlation with outcomes in a cohort of patients with stage III non-small cell lung cancer (NSCLC) who underwent image-guided radiochemotherapy (RCTx). MATERIALS/METHODS: Fifty patients with NSCLC treated with fractionated RT at our institution between 2013 and 2017 were included...
April 5, 2018: Journal of Cancer Research and Clinical Oncology
https://www.readbyqxmd.com/read/29621873/set-up-errors-in-head-and-neck-cancer-treated-with-imrt-technique-assessed-by-cone-beam-computed-tomography-a-feasible-protocol
#18
Durim Delishaj, Stefano Ursino, Francesco Pasqualetti, Fabrizio Matteucci, Agostino Cristaudo, Carlo Pietro Soatti, Amelia Barcellini, Fabiola Paiar
PURPOSE: To investigate set-up errors, suggest the adequate planning target volume (PTV) margin and image-guided radiotherapy frequency in head and neck (H&N) cancer treated with intensity-modulated radiotherapy (IMRT) assessed by kV cone-beam computed tomography (CBCT). METHODS: We analyzed 360 CBCTs in 60 patients with H&N cancer treated with IMRT. The target delineation was contoured according to ICRU62. PTVs were generated by adding a 3-5 mm margin in all directions to the respective clinical target volumes...
March 2018: Radiation Oncology Journal
https://www.readbyqxmd.com/read/29619931/approaches-to-radiotherapy-in-metastatic-spinal-cord-compression
#19
Morten Hiul Suppl
Metastatic spinal cord compression is caused by the progression of metastatic lesions within the vicinity of the spinal cord. The consequences are very severe with loss of neurological function and severe pain. The standard treatment is surgical intervention followed by radiotherapy or radiotherapy alone. However, the majority of patients are treated with radiotherapy only due to contraindications to surgery and technical inoperability. Stereotactic body radiotherapy is a technology to deliver higher radiation dose to the radiotherapy target with the use of spatial coordinates...
April 2018: Danish Medical Journal
https://www.readbyqxmd.com/read/29619375/the-use-of-ultrasound-imaging-in-the-external-beam-radiotherapy-workflow-of-prostate-cancer-patients
#20
REVIEW
Saskia M Camps, Davide Fontanarosa, Peter H N de With, Frank Verhaegen, Ben G L Vanneste
External beam radiotherapy (EBRT) is one of the curative treatment options for prostate cancer patients. The aim of this treatment option is to irradiate tumor tissue, while sparing normal tissue as much as possible. Frequent imaging during the course of the treatment (image guided radiotherapy) allows for determination of the location and shape of the prostate (target) and of the organs at risk. This information is used to increase accuracy in radiation dose delivery resulting in better tumor control and lower toxicity...
2018: BioMed Research International
keyword
keyword
55732
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"