Magnetic resonance spectroscopy.

abstract：PURPOSE:The primary feasibility steps of demonstrating the ability of microwave-induced thermoacoustic (TA) in phantoms have been previously reported. However, none were shown to target a diseased site in living subjects in thermoacoustic tomography (TAT) field so far. To determine the expressions of oncogenic surface ...

journal_title：Medical physics

authors： Nie L,Ou Z,Yang S,Xing D

更新日期：2010-08-01 00:00:00

abstract：PURPOSE:Computational models of microwave tissue ablation are widely used to guide the development of ablation devices, and are increasingly being used for the development of treatment planning and monitoring platforms. Knowledge of temperature-dependent dielectric properties of lung tissue is essential for accurate mo...

journal_title：Medical physics

authors： Sebek J,Bortel R,Prakash P

更新日期：2019-10-01 00:00:00

abstract：PURPOSE:Positron emission tomography (PET) is considered the gold standard for measuring myocardial blood flow in vivo but it is known that respiratory motion can lead to misalignment of the PET and computed tomography (CT) data sets and introduce artifacts in the CT-based attenuation correction (AC) of images. In addi...

journal_title：Medical physics

authors： Pourmoghaddas A,Klein R,deKemp RA,Wells RG

更新日期：2013-02-01 00:00:00

abstract：:The Monte Carlo (MC) method has been shown through many research studies to calculate accurate dose distributions for clinical radiotherapy, particularly in heterogeneous patient tissues where the effects of electron transport cannot be accurately handled with conventional, deterministic dose algorithms. Despite its p...

journal_title：Medical physics

authors： Chetty IJ,Curran B,Cygler JE,DeMarco JJ,Ezzell G,Faddegon BA,Kawrakow I,Keall PJ,Liu H,Ma CM,Rogers DW,Seuntjens J,Sheikh-Bagheri D,Siebers JV

更新日期：2007-12-01 00:00:00

abstract：PURPOSE:Current respiratory motion monitoring devices used for motion synchronization in medical imaging and radiotherapy provide either 1D respiratory signal over a specific region or 3D information based on few external or internal markers. On the other hand, newer technology may offer the potential to monitor the en...

journal_title：Medical physics

authors： Fayad H,Pan T,Clement JF,Visvikis D

更新日期：2011-06-01 00:00:00

abstract：PURPOSE:Transcranial focused ultrasound is an emerging therapeutic modality that can be used to perform noninvasive neurosurgical procedures. The current clinical transcranial phased array operates at 650 kHz, however the development of a higher frequency array would enable more precision, while reducing the risk of st...

journal_title：Medical physics

authors： Pajek D,Hynynen K

更新日期：2013-12-01 00:00:00

abstract：PURPOSE:To automatically detect and isolate areas of low and high stiffness temporal stability in shear wave elastography (SWE) image sequences and define their impact in chronic liver disease (CLD) diagnosis improvement by means of clinical examination study and deep learning algorithm employing convolutional neural n...

journal_title：Medical physics

authors： Gatos I,Tsantis S,Spiliopoulos S,Karnabatidis D,Theotokas I,Zoumpoulis P,Loupas T,Hazle JD,Kagadis GC

更新日期：2019-05-01 00:00:00

abstract：PURPOSE:To study the relationships between dose (D), kerma (K), and collision kerma ( K col ) in photon beams and to investigate total radiative yields for electrons and positrons as a functio...

journal_title：Medical physics

authors： Rogers DWO,Townson RW

更新日期：2019-11-01 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：PURPOSE:Elastography using computer tomography (CT) is a promising methodology that can provide patient-specific regional distributions of lung biomechanical properties. The purpose of this paper is to investigate the feasibility of performing elastography using simulated lower dose CT scans. METHODS:A cohort of eight...

journal_title：Medical physics

authors： Hasse K,Hsieh SS,O'Connell D,Stiehl B,Min Y,Neylon J,Low DA,Santhanam AP

更新日期：2020-08-01 00:00:00

abstract：PURPOSE:This article presents an iterative method for compensation of motion artifacts for slowly rotating computed tomography (CT) systems. Patient's motion introduces inconsistencies among projections and yields severe reconstruction artifacts for free-breathing acquisitions. Streaks and doubling of structures can ap...

journal_title：Medical physics

authors： Schretter C,Rose G,Bertram M

更新日期：2009-11-01 00:00:00

abstract：PURPOSE:To investigate energy deposition in glandular tissues of the breast on macro- and microscopic length scales in the context of mammography. METHODS:Multiscale mammography models of breasts are developed, which include segmented, voxelized macroscopic tissue structure as well as nine regions of interest (ROIs) e...

journal_title：Medical physics

authors： Oliver PAK,Thomson RM

更新日期：2019-03-01 00:00:00

abstract：PURPOSE:The objectives are: (i) assess the development of the impedance of some arteries during the first decades of life; (ii) determine the influence of pulse rate in arterial impedance; (iii) compare the structure of some arterial segments with optimized structures with respect to blood flow; and (iv) explain the el...

journal_title：Medical physics

authors： Silva C,Reis AH

更新日期：2014-06-01 00:00:00

abstract：PURPOSE:The authors' objective was to compare internal dose estimates obtained using the Organ Level Dose Assessment with Exponential Modeling (OLINDA/EXM) software, the voxel S value technique, and Monte Carlo simulation. Monte Carlo dose estimates were used as the reference standard to assess the impact of patient-sp...

journal_title：Medical physics

authors： Grimes J,Celler A

更新日期：2014-09-01 00:00:00

abstract：PURPOSE:To construct a Monte Carlo (MC)-based simulation model for analyzing the dependence of tumor oxygen distribution on different variables related to tumor vasculature [blood velocity, vessel-to-vessel proximity (vessel proximity), and inflowing oxygen partial pressure (pO2)]. METHODS:A voxel-based tissue model c...

journal_title：Medical physics

authors： Lagerlöf JH,Kindblom J,Bernhardt P

更新日期：2014-09-01 00:00:00

abstract：PURPOSE:The purpose of the present study was to perform an analysis of the changes in the dynamic seroma cavity based on fiducial markers in early stage breast cancer patients treated with accelerated partial breast irradiation (APBI) using three-dimensional conformal external beam radiotherapy (3D-CRT). METHODS:A pro...

journal_title：Medical physics

authors： Yue NJ,Haffty BG,Kearney T,Kirstein L,Chen S,Goyal S

更新日期：2013-02-01 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：:We measured the physical imaging performance of a 41 x 41 cm2 amorphous silicon flat panel detector designed for angiographic and R&F imaging applications using methods from the emerging IEC standard for the measurement of detective quantum efficiency (DQE) in digital radiographic detectors. Measurements on 12 product...

journal_title：Medical physics

authors： Granfors PR,Aufrichtig R,Possin GE,Giambattista BW,Huang ZS,Liu J,Ma B

更新日期：2003-10-01 00:00:00

abstract：PURPOSE:Developed herein is a three-dimensional (3D) flow contrast imaging system leveraging advancements in the extension of laser speckle contrast imaging theories to deep tissues along with our recently developed finite-element diffuse correlation tomography (DCT) reconstruction scheme. This technique, termed speckl...

journal_title：Medical physics

authors： Huang C,Irwin D,Lin Y,Shang Y,He L,Kong W,Luo J,Yu G

更新日期：2015-07-01 00:00:00

abstract：PURPOSE:Two diodes which do not require correction factors for small field relative output measurements are designed and validated using experimental methodology. This was achieved by adding an air layer above the active volume of the diode detectors, which canceled out the increase in response of the diodes in small f...

journal_title：Medical physics

authors： Charles PH,Cranmer-Sargison G,Thwaites DI,Kairn T,Crowe SB,Pedrazzini G,Aland T,Kenny J,Langton CM,Trapp JV

更新日期：2014-10-01 00:00:00

abstract：OBJECTIVE:To develop an anthropomorphic, deformable and multimodal pelvis phantom with positron emission tomography extension for radiotherapy (ADAM PETer). METHODS:The design of ADAM PETer was based on our previous pelvis phantom (ADAM) and extended for compatibility with PET and use in 3T magnetic resonance imaging ...

journal_title：Medical physics

authors： Gillmann C,Homolka N,Johnen W,Runz A,Echner G,Pfaffenberger A,Mann P,Schneider V,Hoffmann AL,Troost EGC,Koerber SA,Kotzerke J,Beuthien-Baumann B

更新日期：2020-11-18 00:00:00

abstract：PURPOSE:Manual delineation of head and neck (H&N) organ-at-risk (OAR) structures for radiation therapy planning is time consuming and highly variable. Therefore, we developed a dynamic multiatlas selection-based approach for fast and reproducible segmentation. METHODS:Our approach dynamically selects and weights the a...

journal_title：Medical physics

authors： Haq R,Berry SL,Deasy JO,Hunt M,Veeraraghavan H

更新日期：2019-12-01 00:00:00

abstract：PURPOSE:A radiophotoluminescent glass rod dosimeter (RGD) has recently become commercially available. It is being increasingly used for dosimetry in radiotherapy to measure the absorbed dose including scattered low-energy photons on the body surface of a patient and for postal dosimetry audit. In this article, the dosi...

journal_title：Medical physics

authors： Kadoya N,Shimomura K,Kitou S,Shiota Y,Fujita Y,Dobashi S,Takeda K,Jingu K,Matsushita H,Namito Y,Ban S,Koyama S,Tabushi K

更新日期：2012-10-01 00:00:00

abstract：:Teletherapy with high linear energy transfer radiations (LET), perhaps more than with low LET types, requires careful beam collimation to limit effects to normal structures. Intensity modulated techniques may also hold promise in this regard. Accordingly, a remote computer-controlled, high-resolution multileaf collima...

journal_title：Medical physics

authors： Farr JB,Maughan RL,Yudelev M,Blosser E,Brandon J,Horste T,Forman JD

更新日期：2007-09-01 00:00:00

abstract：PURPOSE:The authors introduce a novel method for defining standardized uptake values (SUVs) in PET∕CT based on routinely collected CT data. The goal of the study is to reduce, if possible, the variability of SUV in a heterogeneous population. Two well established methods for defining SUV are based on body weight (BW) a...

journal_title：Medical physics

authors： Hamill JJ,Sunderland JJ,LeBlanc AK,Kojima CJ,Wall J,Martin EB

更新日期：2013-09-01 00:00:00

abstract：:Monte Carlo dose calculations will potentially reduce systematic errors that may be present in currently used dose calculation algorithms. However, Monte Carlo calculations inherently contain random errors, or statistical uncertainty, the level of which decreases inversely with the square root of computation time. Our...

journal_title：Medical physics

authors： Keall PJ,Siebers JV,Jeraj R,Mohan R

更新日期：2000-03-01 00:00:00

abstract：PURPOSE:Calculations of deoxyribonucleic acid (DNA) damages involve many parameters in the computation process. As these parameters are often subject to uncertainties, it is of central importance to comprehensively quantify their impacts on DNA single-strand break (SSB) and double-strand break (DSB) yields. This has be...

journal_title：Medical physics

authors： Lai Y,Tsai MY,Tian Z,Qin N,Yan C,Hung SH,Chi Y,Jia X

更新日期：2020-04-01 00:00:00

abstract：PURPOSE:In using flat panel detectors (FPD) for cone beam computed tomography (CBCT), pixel gain variations may lead to structured nonuniformities in projections and ring artifacts in CBCT images. Such gain variations can be caused by change in detector entrance exposure levels or beam hardening, and they are not accou...

journal_title：Medical physics

authors： Altunbas C,Lai CJ,Zhong Y,Shaw CC

更新日期：2014-09-01 00:00:00

abstract：PURPOSE:The purpose of this study was to characterize the Hounsfield unit (HU) distributions of mesothelioma and other tissues present in contrast-enhanced thoracic CT scans, to compare the HU distributions of mesothelioma, muscle, and liver by scanner and reconstruction filter/kernel combination, and to assess interpa...

journal_title：Medical physics

authors： Corson N,Sensakovic WF,Straus C,Starkey A,Armato SG 3rd

更新日期：2011-02-01 00:00:00

abstract：:Lag in fluoroscopic systems introduces a frame-averaging effect that reduces measurements of image noise and incorrectly inflates measurements of the detective quantum efficiency (DQE). A correction can be implemented based on measurements of the temporal modulation transfer function (MTF). We introduce a method of me...

journal_title：Medical physics

authors： Friedman SN,Cunningham IA

更新日期：2008-06-01 00:00:00