Subvoxel precise skeletons of volumetric data based on fast marching methods.

abstract：PURPOSE:To investigate the difference of MR percent breast density measured from fat-suppressed versus nonfat-suppressed imaging sequences. METHODS:Breast magnetic resonance imaging (MRI) with and without fat suppression was acquired from 38 subjects. Breasts were divided into subgroups of different morphological patt...

journal_title：Medical physics

authors： Chang DH,Chen JH,Lin M,Bahri S,Yu HJ,Mehta RS,Nie K,Hsiang DJ,Nalcioglu O,Su MY

更新日期：2011-11-01 00:00:00

abstract：:We propose a new method based on statistical analysis technique to determine the minimum setup distance of a well chamber used in the calibration of 192Ir high dose rate (HDR). The chamber should be placed at least this distance away from any wall or from the floor in order to mitigate the effect of scatter. Three dif...

journal_title：Medical physics

authors： Chang L,Ho SY,Chui CS,Lee JH,Du YC,Chen T

更新日期：2008-06-01 00:00:00

abstract：:We designed a questionnaire to be filled out by the physicist at the time of planning treatment with the aid of a computer in order to assess what was learned during the course of the planning session. We analyzed the results to gauge the impact of the 70 treatment planning sessions conducted during the one month peri...

journal_title：Medical physics

authors： Doppke KP,Goitein M

更新日期：1988-03-01 00:00:00

abstract：PURPOSE:Scatter is a major factor degrading the image quality of cone beam computed tomography (CBCT). Conventional scatter correction strategies require handcrafted analytical models with ad hoc assumptions, which often leads to less accurate scatter removal. This study aims to develop an effective scatter correction ...

journal_title：Medical physics

authors： Nomura Y,Xu Q,Shirato H,Shimizu S,Xing L

更新日期：2019-07-01 00:00:00

abstract：PURPOSE:Intracavitary accelerated partial breast irradiation (APBI) has become a popular treatment for early stage breast cancer in recent years due to its shortened course of treatment and simplified treatment planning compared to traditional external beam breast conservation therapy. However, the exit dose to the ski...

journal_title：Medical physics

authors： Raffi JA,Davis SD,Hammer CG,Micka JA,Kunugi KA,Musgrove JE,Winston JW Jr,Ricci-Ott TJ,DeWerd LA

更新日期：2010-06-01 00:00:00

abstract：:Charge coupled devices (CCDs) are being increasingly used in radiation therapy for dosimetric purposes. However, CCDs are sensitive to stray radiation. This effect induces transient noise. Radiation-induced noise strongly alters the image and therefore limits its quantitative analysis. The purpose of this work is to c...

journal_title：Medical physics

authors： Archambault L,Briere TM,Beddar S

更新日期：2008-10-01 00:00:00

abstract：:We are investigating computerized methods to ultimately characterize bone trabecular pattern from clinical skeletal radiographs. In this paper, we present a "phantom" for potential use in the development and evaluation of computerized methods for characterizing radiographic trabecular patterns and ultimately bone stre...

journal_title：Medical physics

authors： Chinander MR,Giger ML,Martell JM,Jiang C,Favus MJ

更新日期：1999-11-01 00:00:00

abstract：PURPOSE:The Imaging and Radiation Oncology Core Houston (IROC-H) (formerly the Radiological Physics Center) has reported varying levels of agreement in their anthropomorphic phantom audits. There is reason to believe one source of error in this observed disagreement is the accuracy of the dose calculation algorithms an...

journal_title：Medical physics

authors： Faught AM,Davidson SE,Fontenot J,Kry SF,Etzel C,Ibbott GS,Followill DS

更新日期：2017-09-01 00:00:00

abstract：PURPOSE:Automatic breast ultrasound (ABUS) imaging has become an essential tool in breast cancer diagnosis since it provides complementary information to other imaging modalities. Lesion segmentation on ABUS is a prerequisite step of breast cancer computer-aided diagnosis (CAD). This work aims to develop a deep learnin...

journal_title：Medical physics

authors： Lei Y,He X,Yao J,Wang T,Wang L,Li W,Curran WJ,Liu T,Xu D,Yang X

更新日期：2020-10-30 00:00:00

abstract：PURPOSE:To determine the feasibility and potential utility of cone beam CT on breast biopsies. METHODS:CBCT simulations were done with a setup which emulates an MX-20 digital specimen radiography system (Faxitron X-Ray Corporation, Chicago, IL), albeit a DQE = 1 was assumed. The phantom consisted of a 5mm diameter cyl...

journal_title：Medical physics

authors： Laamanen C,LeClair R

更新日期：2012-07-01 00:00:00

abstract：:Image intensifier-television-video digitizer (IITVD) systems are commonly used for digital planar image acquisition in radiology. However, the well-known distortions inherent in these systems limit their utility in research and in some clinical applications where quantitatively correct images are required. Software co...

journal_title：Medical physics

authors： Boone JM,Seibert JA,Barrett WA,Blood EA

更新日期：1991-03-01 00:00:00

abstract：PURPOSE:Intraoperative electron radiation therapy (IOERT) involves the delivery of a high radiation dose during tumor resection in a shorter time than other radiation techniques, thus improving local control of tumors. However, a linear accelerator device is needed to produce the beam safely. Mobile linear accelerators...

journal_title：Medical physics

authors： Marinetto E,Victores JG,García-Sevilla M,Muñoz M,Calvo FÁ,Balaguer C,Desco M,Pascau J

更新日期：2017-10-01 00:00:00

abstract：PURPOSE:The feasibility of intensity modulated brachytherapy (IMBT) to improve dose conformity for irregularly shaped targets has been previously investigated by researchers by means of using partially shielded sources. However, partial shielding does not fully explore the potential of IMBT. The goal of this study is t...

journal_title：Medical physics

authors： Shi C,Guo B,Cheng CY,Esquivel C,Eng T,Papanikolaou N

更新日期：2010-07-01 00:00:00

abstract：:With the increasing complexity of dose patterns external beam radiotherapy, there is a great need for new types of dosimeters. We studied the first prototype of a new dosimeter array consisting of water-equivalent plastic scintillating fibers for dose measurement in external beam radiotherapy. We found that this array...

journal_title：Medical physics

authors： Archambault L,Beddar AS,Gingras L,Lacroix F,Roy R,Beaulieu L

更新日期：2007-05-01 00:00:00

abstract：:Flat-panel (FP) based digital radiography systems have recently been introduced as a new and improved digital radiography technology; it is important to evaluate and compare this new technology with currently widely used conventional screen/film (SF) and computed radiography (CR) techniques. In this study, the low-con...

journal_title：Medical physics

authors： Rong XJ,Shaw CC,Liu X,Lemacks MR,Thompson SK

更新日期：2001-11-01 00:00:00

abstract：PURPOSE:A new technique called "curvilinear approach" for prostate seed implantation has been proposed. The purpose of this study is to evaluate the dosimetric benefit of curvilinear distribution of seeds for low-dose-rate (LDR) prostate brachytherapy. METHODS:Twenty LDR prostate brachytherapy cases planned intraopera...

journal_title：Medical physics

authors： Podder TK,Dicker AP,Hutapea P,Darvish K,Yu Y

更新日期：2012-04-01 00:00:00

abstract：:A small, lightweight, single-focusing magnetic spectrometer was designed, assembled, and tested for analysis of electron beams from radiotherapy electron linacs. The objective was to develop a low cost, simple device that could be easily replicated in other medical centers, and to demonstrate the practicality of indiv...

journal_title：Medical physics

authors： Deasy JO,Almond PR,McEllistrem MT,Ross CK

更新日期：1994-11-01 00:00:00

abstract：:The method of magnetic resonance imaging (MRI) was an extension of nuclear magnetic resonance (NMR) spectroscopy that was enabled by computational systems capable of performing the Fast Fourier Transform. Initially, a diverse group of methods were proposed for producing images with NMR, with the multi-slice spin-warp ...

journal_title：Medical physics

authors： Clarke G

更新日期：2012-06-01 00:00:00

abstract：PURPOSE:To develop a novel three-dimensional (3D) hybrid-encoding framework using compressed sensing (CS) and Toeplitz encoding with variable phase-scrambled radio-frequency (RF) excitation, which has the following advantages: low power deposition of RF pulses, reduction of the signal dynamic range, no additional hardw...

journal_title：Medical physics

authors： Wang H,Liang D,Su S,King KF,Chang Y,Liu X,Zheng H,Ying L

更新日期：2020-04-01 00:00:00

abstract：:Positron emission mammography (PEM) is a new, specialized imaging modality utilizing PET radiopharmaceuticals to detect breast cancer. The capabilities and limitations of PEM in detecting breast tumors were investigated with a series of phantom experiments. The PEM imager was mounted on a standard Lorad biopsy table (...

journal_title：Medical physics

authors： Raylman RR,Majewski S,Wojcik R,Weisenberger AG,Kross B,Popov V,Bishop HA

更新日期：2000-08-01 00:00:00

abstract：PURPOSE:The purpose of the paper was to use a virtual phantom to identify a set of radiomic features from T1-weighted and T2-weighted magnetic resonance imaging (MRI) of the brain which is stable to variations in image acquisition parameters and to evaluate the effect of image preprocessing on radiomic features stabili...

journal_title：Medical physics

authors： Bologna M,Corino V,Mainardi L

更新日期：2019-11-01 00:00:00

abstract：PURPOSE:Wide bore CT scanners use extended field-of-view (eFOV) reconstruction algorithms to attempt to recreate tissue truncated due to large patient habitus. Radiation therapy planning systems rely on accurate CT numbers in order to correctly plan and calculate radiation dose. This study looks at the impact of eFOV r...

journal_title：Medical physics

authors： Cheung JP,Shugard E,Mistry N,Pouliot J,Chen J

更新日期：2019-02-01 00:00:00

abstract：PURPOSE:We have recently developed a dynamic tumor tracking irradiation system using Vero4DRT (MHI-Tm2 000). It is needed to create a 4D correlation model between a fiducial marker implanted near a tumor and an external surrogate as a function of time by continuously acquiring both fluoroscopy images and external surro...

journal_title：Medical physics

authors： Shiinoki T,Sawada A,Ishihara Y,Miyabe Y,Fujimoto T,Nakai T,Matsuo Y,Mizowaki T,Kokubo M,Hiraoka M

更新日期：2012-06-01 00:00:00

abstract：:Depth dose distributions for a d(14)Be neutron beam, measured separately for total and gamma absorbed dose, are presented for nine tissue substitutes and for two field sizes. These data are used to examine methods to transform depth dose curves from one material to another. Best results are found when the local depths...

journal_title：Medical physics

authors： Hensley FW,Rassow J,Temme A

更新日期：1985-05-01 00:00:00

abstract：PURPOSE:Scattered radiation remains to be a major cause of image quality degradation in Flat Panel Detector (FPD)-based Cone-beam computed tomography (CBCT). We have been investigating a novel two-dimensional antiscatter grid (2D-ASG) concept to reduce scatter intensity, and hence improve CBCT image quality. We present...

journal_title：Medical physics

authors： Alexeev T,Kavanagh B,Miften M,Altunbas C

更新日期：2018-02-01 00:00:00

abstract：PURPOSE:In this work, the authors introduce a novel framework, the anatomically constrained registration (AnCoR) scheme and apply it to create a fused anatomic-disease atlas of the prostate which the authors refer to as the prostatome. The prostatome combines a MRI based anatomic and a histology based disease atlas. St...

journal_title：Medical physics

authors： Rusu M,Bloch BN,Jaffe CC,Genega EM,Lenkinski RE,Rofsky NM,Feleppa E,Madabhushi A

更新日期：2014-07-01 00:00:00

abstract：:We applied Monte Carlo methods for the simulation of x-ray scattering in water phantoms. The phantom thickness was varied from 5 to 20 cm, and the monoenergetic incident x rays were varied from 15 to 100 keV. Eight screen pairs and a total absorption system were used as x-ray receptors. We determined the angular, spec...

journal_title：Medical physics

authors： Chan HP,Doi K

更新日期：1985-03-01 00:00:00

abstract：PURPOSE:To commission and benchmark a vendor-supplied (Varian Medical Systems) Monte Carlo phase-space data for the 6 MV flattening filter free (FFF) energy mode on a TrueBeam linear accelerator for the purpose of quality assurance of clinical volumetric modulated arc therapy (VMAT) treatment plans. A method for render...

journal_title：Medical physics

authors： Gete E,Duzenli C,Milette MP,Mestrovic A,Hyde D,Bergman AM,Teke T

更新日期：2013-02-01 00:00:00

abstract：PURPOSE:A prototype in-house program was developed to assist deriving image guidance shifts clinically using our 4DCT method for lung SBRT. METHODS:Our in-house prototype program was implemented in MATLAB. The 4D DICOM CT dataset of interest is imported by the program from AW and subsequently accepts input from the us...

journal_title：Medical physics

authors： Wang B,Sarkar V,Busselberg C,Rassiah-Szegedi P,Zhao H,Huang Y,Szegedi M,Salter B

更新日期：2012-06-01 00:00:00

abstract：:The use of Kumakhov capillary optics will significantly enhance the performance of near-monochromatic, Compton backscattered x-ray programs. The Vanderbilt University Medical Free-Electron Laser Center is developing the capability to create these tunable x rays for medical imaging. The present transport has only refle...

journal_title：Medical physics

authors： Tompkins PA,Abreu CC,Carroll FE,Xiao QF,MacDonald CA

更新日期：1994-11-01 00:00:00