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https://www.readbyqxmd.com/read/28092537/detail-enhanced-multi-scale-exposure-fusion
#1
Zhengguo Li, Zhe Wei, Changyun Wen, Jinghong Zheng
Multi-scale exposure fusion is an effective image enhancement technique for a high dynamic range (HDR) scene. In this paper, a new multi-scale exposure fusion algorithm is proposed to merge differently exposed low dynamic range (LDR) images by using the weighted guided image filter (WGIF) to smooth the Gaussian pyramids of weight maps for all the LDR images. Details in the brightest and darkest regions of the HDR scene are preserved better by the proposed algorithm without relative brightness change in the fused image...
January 16, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28092218/analysis-of-the-effect-of-chronic-and-low-dose-radiation-exposure-on-spermatogenic-cells-of-male-large-japanese-field-mice-apodemus-speciosus-after-the-fukushima-daiichi-nuclear-power-plant-accident
#2
Sachio Takino, Hideaki Yamashiro, Yukou Sugano, Yohei Fujishima, Akifumi Nakata, Kosuke Kasai, Gohei Hayashi, Yusuke Urushihara, Masatoshi Suzuki, Hisashi Shinoda, Tomisato Miura, Manabu Fukumoto
In this study we analyzed the effect of chronic and low-dose-rate (LDR) radiation on spermatogenic cells of large Japanese field mice ( Apodemus speciosus ) after the Fukushima Daiichi Nuclear Power Plant (FNPP) accident. In March 2014, large Japanese field mice were collected from two sites located in, and one site adjacent to, the FNPP ex-evacuation zone: Tanashio, Murohara and Akogi, respectively. Testes from these animals were analyzed histologically. External dose rate from radiocesium (combined (134)Cs and (137)Cs) in these animals at the sampling sites exhibited 21 μGy/day in Tanashio, 304-365 μGy/day in Murohara and 407-447 μGy/day in Akogi...
January 16, 2017: Radiation Research
https://www.readbyqxmd.com/read/28068523/rs12941170-at-sox9-gene-associated-with-orofacial-clefts-in-chinese
#3
Zhong-Lin Jia, Sha He, Shu-Yuan Jiang, Bi-He Zhang, Shi-Jun Duan, Jia-Yu Shi, Ning Huang, Wen-Chao Zhu, Bing Shi
OBJECTIVE: Non-syndromic orofacial cleftings (NSOCs) are considered as complex trait, which results from genetic and/or environmental modifiers. Current findings could only explain small portion of the NSOCs. SOX9 gene plays an important role during craniofacial development in animal models and the Pierre Robin sequence (PRS). However, its role in non-syndromic clefts remains unknown. DESIGN: In this study, we selected eight SNPs in and around SOX9 gene to make maximum coverage, and genotyped them by using RFLP-PCR and ligase detection reaction (LDR) methods to test its associations among 151 NSOCs (53 NSCLP, 52 NSCLO and 46 NSCPO) from Western Han Chinese population...
December 30, 2016: Archives of Oral Biology
https://www.readbyqxmd.com/read/28048900/su-f-t-43-prediction-of-dose-increments-by-brain-metastases-resection-cavity-shrinkage-model-with-i-125-and-cs-131-ldr-seed-implantations
#4
D Han, S Braunstein, P Sneed, M McDermott, L Ma
PURPOSE: This work aims to determine dose variability via a brain metastases resection cavity shrinkage model (RC-SM) with I-125 or Cs-131 LDR seed implantations. METHODS: The RC-SM was developed to represent sequential volume changes of 95 consecutive brain metastases patients. All patients underwent serial surveillance MR and change in cavity volume was recorded for each patient. For the initial resection cavity, a prolate-ellipsoid cavity model was suggested and applied volume shrinkage rates to correspond to 1...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048896/su-f-t-03-radiobiological-evaluation-of-a-directional-brachytherapy-device-surgically-implanted-following-ebrt
#5
M J Rivard, J G Emrich, J Poli
PURPOSE: Preceding surgical implantation following external-beam radiotherapy (EBRT) delivery, a radiobiological evaluation was performed for a new LDR Pd-103 directional brachytherapy device (CivaSheet). As this was the first case with the device used in combination with EBRT, there was concern to determine the appropriate prescription dose. METHODS: The radiobiological model of Dale (1985, 1989) was used for a permanent LDR implant including radioactive decay...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048819/mo-b-brc-01-introduction
#6
J Prisciandaro
: Brachytherapy has proven to be an effective treatment option for prostate cancer. Initially, prostate brachytherapy was delivered through permanently implanted low dose rate (LDR) radioactive sources; however, high dose rate (HDR) temporary brachytherapy for prostate cancer is gaining popularity. Needle insertion during prostate brachytherapy is most commonly performed under ultrasound (U/S) guidance; however, treatment planning may be performed utilizing several imaging modalities either in an intra- or post-operative setting...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048540/we-de-201-04-cross-validation-of-knowledge-based-treatment-planning-for-prostate-ldr-brachytherapy-using-principle-component-analysis
#7
J Roper, B Ghavidel, V Chanyavanich, K Godette, E Schreibmann
PURPOSE: To validate a knowledge-based algorithm for prostate LDR brachytherapy treatment planning. METHODS: A dataset of 100 cases was compiled from an active prostate seed implant service. Cases were randomized into 10 subsets. For each subset, the 90 remaining library cases were registered to a common reference frame and then characterized on a point by point basis using principle component analysis (PCA). Each test case was converted to PCA vectors using the same process and compared with each library case using a Mahalanobis distance to evaluate similarity...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048324/su-g-201-02-application-of-raystretch-in-clinical-cases-a-calculation-for-heterogeneity-corrections-in-ldr-permanent-i-125-prostate-brachytherapy
#8
F Hueso-Gonzalez, J Vijande, F Ballester, J Perez-Calatayud, F Siebert
PURPOSE: Tissue heterogeneities and calcifications have significant impact on the dosimetry of low energy brachytherapy (BT). RayStretch is an analytical algorithm developed in our institution to incorporate heterogeneity corrections in LDR prostate brachytherapy. The aim of this work is to study its application in clinical cases by comparing its predictions with the results obtained with TG-43 and Monte Carlo (MC) simulations. METHODS: A clinical implant (71 I-125 seeds, 15 needles) from a real patient was considered...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048248/su-f-t-44-a-comparison-of-the-pre-plan-intra-operative-plan-and-post-implant-dosimetry-for-a-prostate-implant-case-using-prefabricated-linear-polymer-encapsulated-pd-103
#9
R Sheu, A Powers, H McGee, R Stock, Y Lo
PURPOSE: To investigate the reproducibility and limitations of Pd-103 prostate brachytherapy using fixed length linear sources (CivaString). METHODS: An LDR prostate brachytherapy case which was preplanned on MR images with prefabricated linear polymer-encapsulated Pd-103 sources (CivaString) was studied and compared with ultrasound based intra-operative planning and CT based post-implant dosimetry. We evaluated the following parameters among the three studies: prostate geometry (volume and cross sectional area), needle position and alignment deviations, and dosimetry parameters (D90)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048245/su-f-j-157-effect-of-contouring-uncertainty-in-post-implant-dosimetry-of-low-dose-rate-prostate-permanent-seed-brachytherapy
#10
S Mashouf, H Safigholi, T Merino, A Soliman, A Ravi, G Morton, W Song
PURPOSE: There is strong evidence relating post-implant dosimetry for low-dose-rate (LDR) prostate seed brachytherapy to local control rates. The delineation of the prostate on CT images, however, represents a challenge due to the lack of soft tissue contrast in order to identify the prostate borders. This study aims at quantifying the sensitivity of clinically relevant dosimetric parameters to uncertainty in the contouring of prostate. METHODS: CT images, post-op plans and contours of a cohort of patients (n=43) (low risk=55...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048244/su-f-t-05-dosimetric-evaluation-and-validation-of-newlydeveloped-well-chamber-for-use-in-the-calibration-of-brachytherapy-sources
#11
S Saminathan, H Godson, R Ponmalar, R Manickam, J Mazarello
PURPOSE: To evaluate the dosimetric characteristics of newly developed well type ionization chamber and to validate the results with the commercially available calibrated well chambers that are being used for the calibration of brachytherapy sources. METHODS: The newly developed well type ionization chamber (BDS 1000) has been designed for the convenient use in brachytherapy which is open to atmospheric condition. The chamber has a volume of 240 cm3 and weight of 2...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048168/mo-b-brc-02-ultrasound-based-prostate-hdr
#12
Z Chang
: Brachytherapy has proven to be an effective treatment option for prostate cancer. Initially, prostate brachytherapy was delivered through permanently implanted low dose rate (LDR) radioactive sources; however, high dose rate (HDR) temporary brachytherapy for prostate cancer is gaining popularity. Needle insertion during prostate brachytherapy is most commonly performed under ultrasound (U/S) guidance; however, treatment planning may be performed utilizing several imaging modalities either in an intra- or post-operative setting...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048145/su-f-t-40-can-cbct-images-be-used-for-volume-studies-of-prostate-seed-implants-for-boost-treatment
#13
H Xu, S Lee, T Diwanji, P Amin, K Krudys, M Guerrero
PURPOSE: In our clinic, the planning CT is used for definitive and boost low-dose-rate (LDR) brachytherapy treatments to determine the ultrasound volume in the operating room (OR) at the time of the implant. While the CT overestimation of OR volume is known, a larger estimation discrepancy has been observed for boost treatments. A possible reason is the prostate size reduction during EBRT for boost patients. Since cone-beam CT (CBCT) is often used as routine imaging guidance of EBRT, this prostate volume change may be captured...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048138/mo-b-brc-03-ct-based-prostate-hdr
#14
J Zoberi
: Brachytherapy has proven to be an effective treatment option for prostate cancer. Initially, prostate brachytherapy was delivered through permanently implanted low dose rate (LDR) radioactive sources; however, high dose rate (HDR) temporary brachytherapy for prostate cancer is gaining popularity. Needle insertion during prostate brachytherapy is most commonly performed under ultrasound (U/S) guidance; however, treatment planning may be performed utilizing several imaging modalities either in an intra- or post-operative setting...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048130/su-g-tep4-05-an-evaluation-of-a-low-dose-rate-ldr-prostate-brachytherapy-procedure-using-a-failure-modes-and-effects-analysis-fmea
#15
S-K Cheong, J Kim
PURPOSE: The aim of the study is the application of a Failure Modes and Effects Analysis (FMEA) to access the risks for patients undergoing a Low Dose Rate (LDR) Prostate Brachytherapy Treatment. METHODS: FMEA was applied to identify all the sub processes involved in the stages of identifying patient, source handling, treatment preparation, treatment delivery, and post treatment. These processes characterize the radiation treatment associated with LDR Prostate Brachytherapy...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047979/tu-ab-brc-08-egs_brachy-a-fast-and-versatile-monte-carlo-code-for-brachytherapy-applications
#16
M Chamberland, R Taylor, D Rogers, R Thomson
PURPOSE: To introduce egs_brachy, a new, fast, and versatile Monte Carlo code for brachytherapy applications. METHODS: egs_brachy is an EGSnrc user-code based on the EGSnrc C++ class library (egs++). Complex phantom, applicator, and source model geometries are built using the egs++ geometry module. egs_brachy uses a tracklength estimator to score collision kerma in voxels. Interaction, spectrum, energy fluence, and phase space scoring are also implemented. Phase space sources and particle recycling may be used to improve simulation efficiency...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047720/su-f-t-633-cyberknife-boost-versus-conventional-tandem-and-ovoid-treatment-for-cervical-cancer
#17
J Santoro, M Witten, J Haas
PURPOSE: Brachytherapy has been the standard of care for cervical cancer for 100 years. The treatment can be administered using an HDR (high dose rate) remote afterloader with a (192) Ir source in an outpatient setting, a PDR afterloader with a (192) Ir source, or with LDR manually loaded or a remote afterloader utilizing (192) Ir or (137) Cs sources in an inpatient setting. The procedure involves the placement of a tandem and ovoid, tandem and ring, or tandem and cylinder applicator in an operating room setting with the patient under general anesthesia...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047714/mo-b-brc-00-prostate-hdr-treatment-planning-considering-different-imaging-modalities
#18
Joann Prisciandaro
: Brachytherapy has proven to be an effective treatment option for prostate cancer. Initially, prostate brachytherapy was delivered through permanently implanted low dose rate (LDR) radioactive sources; however, high dose rate (HDR) temporary brachytherapy for prostate cancer is gaining popularity. Needle insertion during prostate brachytherapy is most commonly performed under ultrasound (U/S) guidance; however, treatment planning may be performed utilizing several imaging modalities either in an intra- or post-operative setting...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047486/mo-b-brc-04-mri-based-prostate-hdr
#19
F Mourtada
: Brachytherapy has proven to be an effective treatment option for prostate cancer. Initially, prostate brachytherapy was delivered through permanently implanted low dose rate (LDR) radioactive sources; however, high dose rate (HDR) temporary brachytherapy for prostate cancer is gaining popularity. Needle insertion during prostate brachytherapy is most commonly performed under ultrasound (U/S) guidance; however, treatment planning may be performed utilizing several imaging modalities either in an intra- or post-operative setting...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047424/su-f-t-09-in-phantom-full-implant-validation-of-plastic-scintillation-detectors-for-in-vivo-dosimetry-during-low-dose-rate-brachytherapy
#20
F Therriault-Proulx, L Beaulieu, T Bruno, S Beddar
PURPOSE: To validate in a water phantom the use of plastic scintillation detectors to measure dose to the urethra and the rectal wall during a clinically realistic low dose rate (LDR) brachytherapy implant. METHODS: A template was designed to replicate a clinically realistic LDR brachytherapy prostate implant inside a water phantom. Twenty-two catheters were inserted, including one mimicking the urethra and another the rectal wall. The needles inserted in the remaining 20 catheters were composed of thin-walled nylon tubes in which I-125 radioactive seeds (Air Kerma Strengths of (0...
June 2016: Medical Physics
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