Med Biol Eng Comput - Transit dosimetry in dynamic IMRT with an a-Si EPID.

Tópicos

{ imag(1057) registr(996) error(939) }
{ activ(1138) subject(705) human(624) }
{ sampl(1606) size(1419) use(1276) }
{ perform(999) metric(946) measur(919) }
{ system(1976) rule(880) can(841) }
{ data(3963) clinic(1234) research(1004) }
{ measur(2081) correl(1212) valu(896) }
{ take(945) account(800) differ(722) }
{ model(2341) predict(2261) use(1141) }
{ time(1939) patient(1703) rate(768) }
{ surgeri(1148) surgic(1085) robot(1054) }
{ chang(1828) time(1643) increas(1301) }
{ import(1318) role(1303) understand(862) }
{ use(976) code(926) identifi(902) }
{ drug(1928) target(777) effect(648) }
{ method(1219) similar(1157) match(930) }
{ imag(2830) propos(1344) filter(1198) }
{ studi(2440) review(1878) systemat(933) }
{ framework(1458) process(801) describ(734) }
{ algorithm(1844) comput(1787) effici(935) }
{ studi(1119) effect(1106) posit(819) }
{ spatial(1525) area(1432) region(1030) }
{ health(3367) inform(1360) care(1135) }
{ model(3480) simul(1196) paramet(876) }
{ ehr(2073) health(1662) electron(1139) }
{ state(1844) use(1261) util(961) }
{ signal(2180) analysi(812) frequenc(800) }
{ data(3008) multipl(1320) sourc(1022) }
{ first(2504) two(1366) second(1323) }
{ use(2086) technolog(871) perceiv(783) }
{ high(1669) rate(1365) level(1280) }
{ activ(1452) weight(1219) physic(1104) }
{ detect(2391) sensit(1101) algorithm(908) }
{ model(3404) distribut(989) bayesian(671) }
{ can(774) often(719) complex(702) }
{ imag(1947) propos(1133) code(1026) }
{ data(1737) use(1416) pattern(1282) }
{ inform(2794) health(2639) internet(1427) }
{ bind(1733) structur(1185) ligand(1036) }
{ sequenc(1873) structur(1644) protein(1328) }
{ featur(3375) classif(2383) classifi(1994) }
{ network(2748) neural(1063) input(814) }
{ imag(2675) segment(2577) method(1081) }
{ patient(2315) diseas(1263) diabet(1191) }
{ motion(1329) object(1292) video(1091) }
{ assess(1506) score(1403) qualiti(1306) }
{ treatment(1704) effect(941) patient(846) }
{ problem(2511) optim(1539) algorithm(950) }
{ error(1145) method(1030) estim(1020) }
{ learn(2355) train(1041) set(1003) }
{ concept(1167) ontolog(924) domain(897) }
{ clinic(1479) use(1117) guidelin(835) }
{ extract(1171) text(1153) clinic(932) }
{ method(1557) propos(1049) approach(1037) }
{ data(1714) softwar(1251) tool(1186) }
{ design(1359) user(1324) use(1319) }
{ control(1307) perform(991) simul(935) }
{ model(2220) cell(1177) simul(1124) }
{ care(1570) inform(1187) nurs(1089) }
{ general(901) number(790) one(736) }
{ method(984) reconstruct(947) comput(926) }
{ search(2224) databas(1162) retriev(909) }
{ featur(1941) imag(1645) propos(1176) }
{ case(1353) use(1143) diagnosi(1136) }
{ howev(809) still(633) remain(590) }
{ studi(1410) differ(1259) use(1210) }
{ risk(3053) factor(974) diseas(938) }
{ research(1085) discuss(1038) issu(1018) }
{ system(1050) medic(1026) inform(1018) }
{ visual(1396) interact(850) tool(830) }
{ compound(1573) activ(1297) structur(1058) }
{ perform(1367) use(1326) method(1137) }
{ blood(1257) pressur(1144) flow(957) }
{ record(1888) medic(1808) patient(1693) }
{ monitor(1329) mobil(1314) devic(1160) }
{ research(1218) medic(880) student(794) }
{ patient(2837) hospit(1953) medic(668) }
{ model(2656) set(1616) predict(1553) }
{ data(2317) use(1299) case(1017) }
{ age(1611) year(1155) adult(843) }
{ medic(1828) order(1363) alert(1069) }
{ cost(1906) reduc(1198) effect(832) }
{ group(2977) signific(1463) compar(1072) }
{ gene(2352) biolog(1181) express(1162) }
{ intervent(3218) particip(2042) group(1664) }
{ patient(1821) servic(1111) care(1106) }
{ can(981) present(881) function(850) }
{ analysi(2126) use(1163) compon(1037) }
{ health(1844) social(1437) communiti(874) }
{ structur(1116) can(940) graph(676) }
{ cancer(2502) breast(956) screen(824) }
{ use(1733) differ(960) four(931) }
{ result(1111) use(1088) new(759) }
{ implement(1333) system(1263) develop(1122) }
{ survey(1388) particip(1329) question(1065) }
{ estim(2440) model(1874) function(577) }
{ decis(3086) make(1611) patient(1517) }
{ process(1125) use(805) approach(778) }
{ method(1969) cluster(1462) data(1082) }
{ method(2212) result(1239) propos(1039) }

Resumo

Using an amorphous silicon (a-Si) EPID for transit dosimetry requires detailed characterization of its dosimetric response in a variety of conditions. In this study, a measurement-based model was developed to calibrate an a-Si EPID response to dose for transit dosimetry by comparison with a reference ionization chamber. The ionization chamber reference depth and the required additional buildup thickness for electronic portal imaging devices (EPID) transit dosimetry were determined. The combined effects of changes in radiation field size, phantom thickness, and the off-axis distance on EPID transit dosimetry were characterized. The effect of scattered radiation on out-of-field response was investigated for different field sizes and phantom thicknesses by evaluation of the differences in image profiles and in-water measured profiles. An algorithm was developed to automatically apply these corrections to EPID images based on the user-specified field size and phantom thickness. The average phantom thickness and an effective field size were used for IMRT fields, and images were acquired in cine mode in the presence of an anthropomorphic phantom. The effective field size was defined as the percentage of the jaw-defined field that was involved during the delivery. Nine head and neck dynamic IMRT fields were tested by comparison with a MatriXX two-dimensional array dosimeter using the Gamma (3%, 3 mm) evaluation. A depth of 1.5 cm was selected as the ionization chamber reference depth. An additional 2.2 mm of copper buildup was added to the EPID. Comparison of EPID and MatriXX dose images for the tested fields showed that using a 10% threshold, the average number of points with Gamma index <1 was 96.5%. The agreement in the out-of field area was shown by selection of a 2% threshold which on average resulted in 94.8% of points with a Gamma index <1. The suggested method is less complicated than previously reported techniques and can be used for all a-Si EPIDs regardless of the manufacturer.

Resumo Limpo

use amorph silicon asi epid transit dosimetri requir detail character dosimetr respons varieti condit studi measurementbas model develop calibr asi epid respons dose transit dosimetri comparison refer ioniz chamber ioniz chamber refer depth requir addit buildup thick electron portal imag devic epid transit dosimetri determin combin effect chang radiat field size phantom thick offaxi distanc epid transit dosimetri character effect scatter radiat outoffield respons investig differ field size phantom thick evalu differ imag profil inwat measur profil algorithm develop automat appli correct epid imag base userspecifi field size phantom thick averag phantom thick effect field size use imrt field imag acquir cine mode presenc anthropomorph phantom effect field size defin percentag jawdefin field involv deliveri nine head neck dynam imrt field test comparison matrixx twodimension array dosimet use gamma mm evalu depth cm select ioniz chamber refer depth addit mm copper buildup ad epid comparison epid matrixx dose imag test field show use threshold averag number point gamma index agreement outof field area shown select threshold averag result point gamma index suggest method less complic previous report techniqu can use asi epid regardless manufactur

Resumos Similares

Comput Methods Programs Biomed - A method to align the coordinate system of accelerometers to the axes of a human body: The depitch algorithm. ( 0,743032029953606 )
Int J Comput Assist Radiol Surg - Acetabular orientation: anatomical and functional measurement. ( 0,716120133270971 )
Int J Comput Assist Radiol Surg - C-arm angle measurement with accelerometer for brachytherapy: an accuracy study. ( 0,710238732809784 )
J Clin Monit Comput - Solutions to kinking of the side stream carbon dioxide sampling line. ( 0,700826773434837 )
Comput Methods Programs Biomed - Adaptive marker-free registration using a multiple point strategy for real-time and robust endoscope electromagnetic navigation. ( 0,698099072263473 )
Int J Med Robot - A study on the theoretical and practical accuracy of conoscopic holography-based surface measurements: toward image registration in minimally invasive surgery. ( 0,696497562213351 )
IEEE Trans Image Process - Combining head pose and eye location information for gaze estimation. ( 0,695562824316045 )
Int J Comput Assist Radiol Surg - Determining the position of a patient reference from C-Arm views for image guided navigation. ( 0,695004801572007 )
J Med Syst - The effect of textile-based inductive coil sensor positions for heart rate monitoring. ( 0,694048200236098 )
IEEE Trans Image Process - A general fast registration framework by learning deformation-appearance correlation. ( 0,689623217944376 )
Int J Med Robot - Accuracy of a hexapod parallel robot kinematics based external fixator. ( 0,68029312658919 )
Int J Comput Assist Radiol Surg - An electromagnetic Tracker-in-Table configuration for X-ray fluoroscopy and cone-beam CT-guided surgery. ( 0,68013167624048 )
Int J Med Robot - Comparison of optical and electromagnetic tracking for navigated lateral skull base surgery. ( 0,680120904094992 )
Int J Comput Assist Radiol Surg - Quantitative evaluation for accumulative calibration error and video-CT registration errors in electromagnetic-tracked endoscopy. ( 0,679653455062783 )
Int J Comput Assist Radiol Surg - 2D-3D radiograph to cone-beam computed tomography (CBCT) registration for C-arm image-guided robotic surgery. ( 0,677878273088867 )
Int J Comput Assist Radiol Surg - Interventional real-time ultrasound imaging with an integrated electromagnetic field generator. ( 0,677507485894158 )
Comput Math Methods Med - Effect of relative marker movement on the calculation of the foot torsion axis using a combined Cardan angle and helical axis approach. ( 0,67727623098559 )
Med Biol Eng Comput - Indirect measurement of pinch and pull forces at the shaft of laparoscopic graspers. ( 0,67428557738875 )
Int J Comput Assist Radiol Surg - Image-based electrode array tracking for epicardial electrophysiological mapping in minimally invasive arrhythmia surgery. ( 0,663981144870567 )
Int J Comput Assist Radiol Surg - Video-guided calibration of an augmented reality mobile C-arm. ( 0,663421541099899 )
Int J Comput Assist Radiol Surg - Real-time marker-free patient registration for electromagnetic navigated bronchoscopy: a phantom study. ( 0,660639582352468 )
J Med Syst - Unbiased group-wise image registration: applications in brain fiber tract atlas construction and functional connectivity analysis. ( 0,659637421972785 )
Int J Comput Assist Radiol Surg - Analysis of electrode deformations in deep brain stimulation surgery. ( 0,656084176839588 )
Int J Comput Assist Radiol Surg - Three-dimensional histological specimen preparation for accurate imaging and spatial reconstruction of the middle and inner ear. ( 0,655576755748695 )
Med Biol Eng Comput - Effect of fiducial marker defects on stereotactic target localization in the Leksell stereotactic system. ( 0,654716472163076 )
Int J Comput Assist Radiol Surg - Validation of automated ultrasound-CT registration of vertebrae. ( 0,654029678224858 )
Int J Comput Assist Radiol Surg - Calibration of the motor-assisted robotic stereotaxy system: MARS. ( 0,652203763512785 )
Int J Comput Assist Radiol Surg - New prototype neuronavigation system based on preoperative imaging and intraoperative freehand ultrasound: system description and validation. ( 0,646544929532747 )
Int J Med Robot - Accuracy study of a robotic system for MRI-guided prostate needle placement. ( 0,645380377642908 )
Comput Math Methods Med - Effectiveness of variable-gain Kalman filter based on angle error calculated from acceleration signals in lower limb angle measurement with inertial sensors. ( 0,642667957603766 )
Int J Comput Assist Radiol Surg - 4D-CT Lung registration using anatomy-based multi-level multi-resolution optical flow analysis and thin-plate splines. ( 0,642608341510635 )
Int J Comput Assist Radiol Surg - Target visibility enhancement for C-arm cone beam CT-fluoroscopy-guided hepatic needle placement: implementation and accuracy evaluation. ( 0,64232469339278 )
Int J Comput Assist Radiol Surg - A motion constrained cross-wire phantom for tracked 2D ultrasound calibration. ( 0,641077089185618 )
Int J Comput Assist Radiol Surg - Analysis of the micro-migration of sliding hip screws by using point-based registration. ( 0,639732621022236 )
Int J Med Robot - Robust real-time robot-world calibration for robotized transcranial magnetic stimulation. ( 0,639471102061733 )
Med Biol Eng Comput - The effect of head movement on CT perfusion summary maps: simulations with CT hybrid phantom data. ( 0,639234996701398 )
Comput. Aided Surg. - Optimal number and distribution of points selected on the vertebra for surface matching in CT-based spinal navigation. ( 0,638312503521733 )
Int J Med Robot - Anatomical landmarks for point-matching registration in image-guided neurosurgery. ( 0,637617132565621 )
Comput Methods Programs Biomed - Automating the tracking of lymph nodes in follow-up studies of thoracic CT images. ( 0,637594831195918 )
Int J Comput Assist Radiol Surg - Position error reduction in a mechanical tracking linkage for arthroscopic hip surgery. ( 0,635852580420767 )
Comput. Aided Surg. - Properties of the target registration error for surface matching in neuronavigation. ( 0,634399556633381 )
Int J Comput Assist Radiol Surg - Prostate multimodality image registration based on B-splines and quadrature local energy. ( 0,632785523821408 )
Int J Med Robot - Accuracy of a freehand sculpting tool for unicondylar knee replacement. ( 0,6317162663799 )
Int J Comput Assist Radiol Surg - Towards accurate, robust and practical ultrasound-CT registration of vertebrae for image-guided spine surgery. ( 0,630308726742788 )
Int J Med Robot - Evaluation of the factors affecting the optimal fiducial configurations calculated through a genetic-algorithm-based methodology in image-guided neurosurgery. ( 0,630004897228596 )
Int J Comput Assist Radiol Surg - Fully automatic extraction of human spine curve from MR images using methods of efficient intervertebral disk extraction and vertebra registration. ( 0,629227111409815 )
Comput Methods Programs Biomed - An enhanced method for registration of dental surfaces partially scanned by a 3D dental laser scanning. ( 0,628147404831758 )
Int J Comput Assist Radiol Surg - Electromagnetic tracking for US-guided interventions: standardized assessment of a new compact field generator. ( 0,627860789617302 )
Comput. Aided Surg. - Effect of registration mode on neuronavigation precision: an exploration of the role of random error. ( 0,626744193303316 )
Int J Comput Assist Radiol Surg - Aortic valve prosthesis tracking for transapical aortic valve implantation. ( 0,625335130519453 )
Comput Methods Programs Biomed - Creating a virtual slide map from sputum smear images for region-of-interest localisation in automated microscopy. ( 0,620008629492765 )
Comput Methods Programs Biomed - Elastic image registration for guiding focal laser ablation of prostate cancer: preliminary results. ( 0,619152696300363 )
Int J Comput Assist Radiol Surg - Minimization of target registration error for vertebra in image-guided spine surgery. ( 0,612103504017653 )
Int J Comput Assist Radiol Surg - Image registration of pre-procedural MRI and intra-procedural CT images to aid CT-guided percutaneous cryoablation of renal tumors. ( 0,611340525044035 )
IEEE J Biomed Health Inform - Automated recovery of the center of rotation in optical projection tomography in the presence of scattering. ( 0,611312219195621 )
Int J Comput Assist Radiol Surg - Positioning error evaluation of GPU-based 3D ultrasound surgical navigation system for moving targets by using optical tracking system. ( 0,610265061478066 )
Int J Comput Assist Radiol Surg - Fluoroscopy-based laser guidance system for linear surgical tool insertion depth control. ( 0,609923592606835 )
IEEE Trans Image Process - Robust through-the-wall radar image classification using a target-model alignment procedure. ( 0,60967762301405 )
Int J Comput Assist Radiol Surg - Optical coordinate tracking system using afocal optics for image-guided surgery. ( 0,60958472847841 )
Int J Med Robot - Evaluation of a neurosurgical robotic system to make accurate burr holes. ( 0,608081728628073 )
Med Biol Eng Comput - A new layered sensor for simultaneous measurement of EMG, MMG and oxygen consumption at the same position. ( 0,607492455009679 )
Int J Comput Assist Radiol Surg - Fast rigid registration of pre-operative magnetic resonance images to intra-operative ultrasound for neurosurgery based on high confidence gradient orientations. ( 0,605840700245786 )
Med Biol Eng Comput - Towards the development of a novel experimental shoulder simulator with rotating scapula and individually controlled muscle forces simulating the rotator cuff. ( 0,60545186931857 )
Int J Comput Assist Radiol Surg - Optimized viewing angles for cardiac electrophysiology ablation procedures. ( 0,604050569603571 )
Int J Comput Assist Radiol Surg - Accuracy analysis in MRI-guided robotic prostate biopsy. ( 0,60347616987143 )
IEEE Trans Vis Comput Graph - D-Snake: Image Registration by As-Similar-As-Possible Template Deformation. ( 0,602505248748847 )
Int J Comput Assist Radiol Surg - Towards ultrasound probe positioning optimization during prostate needle biopsy using pressure feedback. ( 0,598433903101812 )
Int J Comput Assist Radiol Surg - Ultrasound-CT registration of vertebrae without reconstruction. ( 0,59841533693411 )
Comput Methods Programs Biomed - Using manual prostate contours to enhance deformable registration of endorectal MRI. ( 0,597731877110274 )
Med Biol Eng Comput - Advanced biofeedback from surface electromyography signals using fuzzy system. ( 0,597667037150689 )
Comput Methods Programs Biomed - A passive movement method for parameter estimation of a musculo-skeletal arm model incorporating a modified hill muscle model. ( 0,597070771762868 )
Comput. Aided Surg. - Accuracy of a 3D fluoroscopic navigation system using a flat-panel detector-equipped C-arm. ( 0,596805177580362 )
Int J Comput Assist Radiol Surg - 3D kinematics of mobile-bearing total knee arthroplasty using X-ray fluoroscopy. ( 0,596698427949649 )
Med Biol Eng Comput - Computer-assisted and patient-specific 3-D planning and evaluation of a single-cut rotational osteotomy for complex long-bone deformities. ( 0,593019277875225 )
Med Biol Eng Comput - Optical monitoring of neural networks evoked by focal electrical stimulation on microelectrode arrays using FM dyes. ( 0,592900640786454 )
Int J Comput Assist Radiol Surg - Augmented reality haptic (ARH): an approach of electromagnetic tracking in minimally invasive surgery. ( 0,589911010298874 )
Int J Comput Assist Radiol Surg - Design and analysis of a head-mounted parallel kinematic device for skull surgery. ( 0,589440416272784 )
Methods Inf Med - Lung registration using automatically detected landmarks. ( 0,588722233518086 )
Comput Math Methods Med - Multimodal spatial calibration for accurately registering EEG sensor positions. ( 0,588571883313073 )
Int J Comput Assist Radiol Surg - Experimental evaluation of ultrasound-guided 3D needle steering in biological tissue. ( 0,588308020405192 )
Int J Comput Assist Radiol Surg - Brain-shift compensation by non-rigid registration of intra-operative ultrasound images with preoperative MR images based on residual complexity. ( 0,586867658591041 )
Int J Comput Assist Radiol Surg - Estimation of motion fields by non-linear registration for local lung motion analysis in 4D CT image data. ( 0,586499733584944 )
Med Biol Eng Comput - A real-time system for biomechanical analysis of human movement and muscle function. ( 0,586242514847006 )
Comput Math Methods Med - Gastroscopic image graph: application to noninvasive multitarget tracking under gastroscopy. ( 0,586230917608629 )
J Biomed Inform - Recovery at the edge of error: debunking the myth of the infallible expert. ( 0,586029052301262 )
IEEE Trans Vis Comput Graph - Visualization and Analysis of Vortex-Turbine Intersections in Wind Farms. ( 0,580738705409921 )
J Biomed Inform - Optimal marker placement in hadrontherapy: intelligent optimization strategies with augmented Lagrangian pattern search. ( 0,580001167685125 )
Int J Med Robot - Validation of the femoral component placement during hip resurfacing: a comparison between the conventional jig, patient-specific template, and CT-based navigation. ( 0,57515709094268 )
Med Biol Eng Comput - Gait analysis in children with cerebral palsy via inertial and magnetic sensors. ( 0,573242776669825 )
Comput. Biol. Med. - Interactive development of a CT-based tissue model for ultrasound simulation. ( 0,573142848415631 )
J Telemed Telecare - Quality assessment of X-rays interpreted via teleradiology for M?decins Sans Fronti?res. ( 0,570132819329617 )
Med Biol Eng Comput - In vivo measurement of the 3D kinematics of the temporomandibular joint using miniaturized electromagnetic trackers: technical report. ( 0,569426944715386 )
IEEE J Biomed Health Inform - An intelligent recovery progress evaluation system for ACL reconstructed subjects using integrated 3-D kinematics and EMG features. ( 0,56812062395754 )
Methods Inf Med - Motor Unit Tracking?Using High Density Surface Electromyography (HDsEMG)?. Automated Correction of Electrode Displacement Errors. ( 0,567832099465458 )
Int J Comput Assist Radiol Surg - Deformable registration of preoperative MR, pre-resection ultrasound, and post-resection ultrasound images of neurosurgery. ( 0,567401508106609 )
Comput. Biol. Med. - A novel method for retinal vessel tracking using particle filters. ( 0,565141906764049 )
Int J Comput Assist Radiol Surg - Computer assisted determination of acetabular cup orientation using 2D-3D image registration. ( 0,563462949880317 )
IEEE J Biomed Health Inform - Volume Preserved Mass-spring Model with Novel Constraints for Soft Tissue Deformation. ( 0,563228358222657 )
Int J Comput Assist Radiol Surg - An on-board surgical tracking and video augmentation system for C-arm image guidance. ( 0,562105965172869 )
Comput. Biol. Med. - Reliability and validity of 4D rasterstereography under dynamic conditions. ( 0,560338149656752 )