keyword
MENU ▼
Read by QxMD icon Read
search

Inverse Planning

keyword
https://www.readbyqxmd.com/read/28438215/predicting-liver-sbrt-eligibility-and-plan-quality-for-vmat-and-4%C3%AF-plans
#1
Angelia Tran, Kaley Woods, Dan Nguyen, Victoria Y Yu, Tianye Niu, Minsong Cao, Percy Lee, Ke Sheng
BACKGROUND: It is useful to predict planned dosimetry and determine the eligibility of a liver cancer patient for SBRT treatment using knowledge based planning (KBP). We compare the predictive accuracy using the overlap volume histogram (OVH) and statistical voxel dose learning (SVDL) KBP prediction models for coplanar VMAT to non-coplanar 4π radiotherapy plans. METHODS: In this study, 21 liver SBRT cases were selected, which were initially treated using coplanar VMAT plans...
April 24, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28433524/an-analysis-of-knowledge-based-planning-for-stereotactic-body-radiation-therapy-of-the-spine
#2
Joseph J Foy, Robin Marsh, Randall K Ten Haken, Kelly C Younge, Matthew Schipper, Yilun Sun, Dawn Owen, Martha M Matuszak
PURPOSE: Planning for spine stereotactic body radiation therapy (SBRT) is time consuming, and differences in planner experience and technique result in discrepancies in plan quality between facilities. Here, knowledge-based planning is analyzed to determine if it may be effective in improving the quality and efficiency of spine SBRT planning. MATERIALS AND METHODS: Thirty-eight spine SBRT cases were collected from the University of Michigan database and inverse planned to deliver 3 10-Gy fractions to the planning target volume (PTV)...
March 2, 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/28427838/stratification-strategy-for-evaluating-the-influence-of-diabetes-complication-severity-index-on-the-risk-of-hospitalization-a-record-linkage-data-in-western-australia
#3
Ninh Thi Ha, Mark Harris, Suzanne Robinson, David Preen, Rachael Moorin
OBJECTIVE: This study aimed to develop a risk stratification strategy for evaluating the relationship between complications of diabetes and the risk of diabetic-related hospitalization to accurately classify diabetes severity. METHODS: The study used administrative health records for 40,624 individuals with diabetes aged ≥18years in Western Australian. The adapted Diabetes Complication Severity Index (DCSI), socio-demographic and clinical characteristics were used in random effects negative binomial and threshold effect models to determine the optimal stratification strategy for diabetes severity based on the homogeneity of the risk of hospitalization in response to variation of the DCSI...
April 5, 2017: Journal of Diabetes and its Complications
https://www.readbyqxmd.com/read/28424840/reirradiation-for-recurrent-head-and-neck-cancers-using-charged-particle-or-photon-radiotherapy
#4
Hideya Yamazaki, Yusuke Demizu, Tomoaki Okimoto, Mikio Ogita, Kengo Himei, Satoaki Nakamura, Gen Suzuki, Ken Yoshida, Tadayuki Kotsuma, Yasuo Yoshioka, Ryoongjin Oh
OBJECTIVE: To examine the outcomes of reirradiation for recurrent head and neck cancers using different modalities. METHODS: This retrospective study included 26 patients who received charged particle radiotherapy (CP) and 150 who received photon radiotherapy (117 CyberKnife radiotherapy [CK] and 36 intensity-modulated radiotherapy [IMRT]). Inverse probability of treatment weighting (IPTW) involving propensity scores was used to reduce background selection bias...
April 19, 2017: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/28422654/novel-mri-technique-enables-non-invasive-measurement-of-atrial-wall-thickness
#5
Marta Varela, Ross Morgan, Adeline Theron, Desmond Dillon-Murphy, Henry Chubb, John Whitaker, Markus Henningsson, Paul Aljabar, Tobias Schaeffter, Christoph Kolbitsch, Oleg V Aslanidi
Knowledge of atrial wall thickness (AWT) has the potential to provide important information for patient stratification and the planning of interventions in atrial arrhythmias. To date, information about AWT has only been acquired in post-mortem or poor-contrast CT studies, providing limited coverage and highly variable estimates of AWT. We present a novel contrast agent-free MRI sequence for imaging AWT and use it to create personalized AWT maps and a biatrial atlas. A novel black-blood phase-sensitive inversion recovery protocol was used to image 10 volunteers and 2 atrial fibrillation patients, as proof of concept...
April 13, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28419725/healthcare-costs-and-medication-adherence-among-patients-with-fibromyalgia-combination-medication-vs-duloxetine-milnacipran-venlafaxine-and-pregabalin-initiators
#6
Nicole M Marlow, Kit N Simpson, Ivana A Vaughn, Ara Jo, James S Zoller, E Baron Short
OBJECTIVE: To examine medication adherence and healthcare costs for combination prescription initiators (duloxetine/milnacipran/venlafaxine with pregabalin) versus monotherapy initiators (duloxetine, milnacipran, venlafaxine, and pregabalin) among patients with fibromyalgia syndrome (FMS). METHODS: Our retrospective cohort study used claims data for the South Carolina Blue Cross Blue Shield State Health Plan (SHP). Patients with FMS aged ≥18 years, with prescription initiation from July 1, 2007 through June 30, 2010, and SHP enrollment for 12-months pre- and post-index periods were included (combination: N=100, pregabalin: N=665, duloxetine: N=713, milnacipran: N=131, venlafaxine: N=272)...
April 18, 2017: Pain Practice: the Official Journal of World Institute of Pain
https://www.readbyqxmd.com/read/28412775/defining-value-in-radiation-oncology-approaches-to-weighing-benefits-vs-costs
#7
REVIEW
Andre A Konski
The passage of the Affordable Care Act in 2010 initiated discussion regarding transitioning from a fee-for-service arrangement of care reimbursement to value-based care. Cost-effectiveness analysis (CEA) has been used in the past to quantify value as it relates to the provision of healthcare. New treatments or techniques being compared with other new or existing therapies or approaches to care were determined to be cost-effective if the incremental cost-effectiveness ratio was less than $50,000/life-year or quality-adjusted life-year...
April 15, 2017: Oncology (Williston Park, NY)
https://www.readbyqxmd.com/read/28412136/dose-painting-by-means-of-monte-carlo-treatment-planning-at-the-voxel-level
#8
E Jiménez-Ortega, A Ureba, A Vargas, J A Baeza, A Wals-Zurita, F J García-Gómez, A R Barbeiro, A Leal
PURPOSE: To develop a new optimization algorithm to carry out true dose painting by numbers (DPBN) planning based on full Monte Carlo (MC) calculation. METHODS: Four configurations with different clustering of the voxel values from PET data were proposed. An optimization method at the voxel level under Lineal Programming (LP) formulation was used for an inverse planning and implemented in CARMEN, an in-house Monte Carlo treatment planning system. RESULTS: Beamlet solutions fulfilled the objectives and did not show significant differences between the different configurations...
April 12, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28411552/reliability-of-four-models-for-clinical-gait-analysis
#9
Hans Kainz, David Graham, Julie Edwards, Henry P J Walsh, Sheanna Maine, Roslyn N Boyd, David G Lloyd, Luca Modenese, Christopher P Carty
Three-dimensional gait analysis (3DGA) has become a common clinical tool for treatment planning in children with cerebral palsy (CP). Many clinical gait laboratories use the conventional gait analysis model (e.g. Plug-in-Gait model), which uses Direct Kinematics (DK) for joint kinematic calculations, whereas, musculoskeletal models, mainly used for research, use Inverse Kinematics (IK). Musculoskeletal IK models have the advantage of enabling additional analyses which might improve the clinical decision-making in children with CP...
April 3, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28399356/understanding-the-influence-of-socioeconomic-environment-on-paediatric-anti-retroviral-treatment-coverage-towards-closing-treatment-gaps-in-sub-saharan-africa
#10
Daniel A Adeyinka, Meirion R Evans, Chamberline E Ozigbu, Hugo van Woerden, Esther F Adeyinka, Olanrewaju Oladimeji, Chris Aimakhu, Deborah Odoh, Dick Chamla
OBJECTIVE: Many sub-Saharan African countries have massively scaled-up their antiretroviral treatment (ART) programmes, but many national programmes still show large gaps in paediatric ART coverage making it challenging to reduce AIDS-related deaths among HIV-infected children. We sought to identify enablers of paediatric ART coverage in Africa by examining the relationship between paediatric ART coverage and socioeconomic parameters measured at the population level so as to accelerate reaching the 90-90-90 targets...
March 2017: Central European Journal of Public Health
https://www.readbyqxmd.com/read/28398630/mitigating-differential-baseline-shifts-in-locally-advanced-lung-cancer-patients-using-an-average-anatomy-model
#11
Mehrsima Abdoli, Simon R van Kranen, Uros Stankovic, Maddalena M G Rossi, Jose S A Belderbos, Jan-Jakob Sonke
BACKGROUND AND PURPOSE: Differential baseline shifts between primary tumor and involved lymph nodes in locally advanced lung cancer patients compromise the accuracy of radiotherapy. The purpose of this study was to evaluate the performance of an average anatomy model (AAM) derived from repeat imaging and deformable registration to reduce these geometrical uncertainties. METHODS AND MATERIALS: An in-house implementation of a B-Spline deformable image registration (DIR) algorithm was first validated using three different validation approaches: 1) a circle method to test the consistency of the DIR, 2) fiducial marker target registration error, and 3) the recovery of a known deformation vector field (DVF)...
April 11, 2017: Medical Physics
https://www.readbyqxmd.com/read/28379849/sparsity-constrained-split-feasibility-for-dose-volume-constraints-in-inverse-planning-of-intensity-modulated-photon-or-proton-therapy
#12
Scott Penfold, Rafał Zalas, Margherita Casiraghi, Mark Brooke, Yair Censor, Reinhard Schulte
A split feasibility formulation for the inverse problem of intensity-modulated radiation therapy treatment planning with dose-volume constraints included in the planning algorithm is presented. It involves a new type of sparsity constraint that enables the inclusion of a percentage-violation constraint in the model problem and its handling by continuous (as opposed to integer) methods. We propose an iterative algorithmic framework for solving such a problem by applying the feasibility-seeking CQ-algorithm of Byrne combined with the automatic relaxation method that uses cyclic projections...
April 5, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28378052/three-dimensional-morphometric-analysis-of-the-talus-implication-for-variations-in-kinematics-of-the-subtalar-joint
#13
Shuhei Nozaki, Kota Watanabe, Masaki Katayose
PURPOSE: Three-dimensional (3D) movement of the clinical subtalar joint (CSTJ) is primarily determined by the morphology of the articular surfaces of the talus. The purposes of this study were to assess the 3D orientation of the CSTJ facets of the talus and the talar head and to determine the tri-axial angular relationship. METHODS: Fifty dry tali were scanned using computed tomography to create a 3D bone model of the talus. The tri-axial angles of the anterior, middle, and posterior facets and the talar head were calculated...
April 4, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/28364045/diagnostic-accuracy-of-3-0-t-magnetic-resonance-t1-and-t2-mapping-and-t2-weighted-dark-blood-imaging-for-the-infarct-related-coronary-artery-in-non-st-segment-elevation-myocardial-infarction
#14
Jamie Layland, Samuli Rauhalammi, Matthew M Y Lee, Nadeem Ahmed, Jaclyn Carberry, Vannesa Teng Yue May, Stuart Watkins, Christie McComb, Kenneth Mangion, John D McClure, David Carrick, Anna O'Donnell, Arvind Sood, Margaret McEntegart, Keith G Oldroyd, Aleksandra Radjenovic, Colin Berry
BACKGROUND: Patients with recent non-ST-segment elevation myocardial infarction commonly have heterogeneous characteristics that may be challenging to assess clinically. METHODS AND RESULTS: We prospectively studied the diagnostic accuracy of 2 novel (T1, T2 mapping) and 1 established (T2-weighted short tau inversion recovery [T2W-STIR]) magnetic resonance imaging methods for imaging the ischemic area at risk and myocardial salvage in 73 patients with non-ST-segment elevation myocardial infarction (mean age 57±10 years, 78% male) at 3...
March 31, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28360536/intensity-modulated-radiation-therapy-for-early-stage-breast-cancer-is-it-ready-for-prime-time
#15
REVIEW
Tabitha Y Chan, Poh Wee Tan, Johann I Tang
Whole breast external beam radiotherapy (WBEBRT) is commonly used as an essential arm in the treatment management of women with early-stage breast cancer. Dosimetry planning for conventional WBEBRT typically involves a pair of tangential fields. Advancement in radiation technology and techniques has the potential to improve treatment outcomes with clinically meaningful long-term benefits. However, this advancement must be balanced with safety and improved efficacy. Intensity-modulated radiation therapy (IMRT) is an advanced technique that shows promise in improving the planning process and radiation delivery...
2017: Breast Cancer: Targets and Therapy
https://www.readbyqxmd.com/read/28360394/the-drosophila-bipectinata-species-complex-phylogenetic-relationship-among-different-members-based-on-chromosomal-variations
#16
Parul Banerjee, Bashisth N Singh
Making interspecific hybridizations, where possible remains an unparalleled option for studying the intricacies of speciation. In the Drosophila bipectinata species complex comprising of four species, namely D. bipectinata, D. parabipectinata, D. malerkotliana and D. pseudoananassae, interspecific hybrids can be obtained in the laboratory, thus bequeathing an ideal opportunity for studying speciation and phylogeny. With the view of investigating the degree of divergence between each species pair, we planned to study the polytene chromosomes of the F1 hybrids, as it would mirror the level of compatibility between the genomes of the parental species...
March 2017: Journal of Genetics
https://www.readbyqxmd.com/read/28346267/generalizing-study-results-a-potential-outcomes-perspective
#17
Catherine R Lesko, Ashley L Buchanan, Daniel Westreich, Jessie K Edwards, Michael G Hudgens, Stephen R Cole
Great care is taken in epidemiologic studies to ensure the internal validity of causal effect estimates; however, external validity has received considerably less attention. When the study sample is not a random sample of the target population, the sample average treatment effect, even if internally valid, cannot usually be expected to equal the average treatment effect in the target population. The utility of an effect estimate for planning purposes and decision making will depend on the degree of departure from the true causal effect in the target population due to problems with both internal and external validity...
March 24, 2017: Epidemiology
https://www.readbyqxmd.com/read/28344609/treatment-planning-for-multicatheter-interstitial-brachytherapy-of-breast-cancer-from-paris-system-to-anatomy-based-inverse-planning
#18
REVIEW
Tibor Major, Csaba Polgár
In the last decades, treatment planning for multicatheter interstitial breast brachytherapy has evolved considerably from fluoroscopy-based 2D to anatomy-based 3D planning. To plan the right positions of the catheters, ultrasound or computed tomography (CT) imaging can be used, but the treatment plan is always based on postimplant CT images. With CT imaging, the 3D target volume can be defined more precisely and delineation of the organs at risk volumes is also possible. Consequently, parameters calculated from dose-volume histogram can be used for quantitative plan evaluation...
February 2017: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/28342360/ensemble-based-release-estimation-for-accidental-river-pollution-with-known-source-position
#19
Xiaole Zhang, Meng Huang
Dispersion model is an important tool for decision makers to accurately assess risks and effectively plan countermeasures during river pollution accidents, but their applications suffer from significant modeling uncertainties, primarily due to the scarce information of the source. A fully sequential inverse estimation method is proposed to reconstruct the temporal release for accidental river pollution. The method is based on a one-dimensional advection-dispersion model in conjunction with the augmented ensemble Kalman filter method...
March 15, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28325472/dosimetric-comparison-between-treatment-plans-of-patients-treated-with-low-dose-rate-vs-high-dose-rate-interstitial-prostate-brachytherapy-as-monotherapy-initial-findings-of-a-randomized-clinical-trial
#20
T Major, C Polgár, K Jorgo, G Stelczer, P Ágoston
PURPOSE: The aim of this study was to compare the dosimetry of intraoperative dose plans of prostate cancer patients treated with low-dose-rate (LDR) and high-dose-rate (HDR) interstitial brachytherapy (BT). METHODS AND MATERIALS: A randomized clinical trial was initiated at our institution to compare the results and side effects of LDR and HDR BT as monotherapy in the treatment of early, organ-confined prostate cancer patients. Eighty-seven patients were randomly assigned to receive HDR afterloading BT with one fraction of 19 Gy or permanent LDR (125)I seed BT with 145 Gy...
March 15, 2017: Brachytherapy
keyword
keyword
60686
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"