Referenceless proton resonance frequency prf shift thermometry provides a means to measure temperature changes during minimally invasive thermotherapy that is inherently robust to motion and tissue displacement. Pauly magnetic resonance in medicine 64 4, 10681077, 2010. However, conventional prf thermometry relies on the subtraction of baseline. Neglecting global offsets, the phase of the reconstructed image, x. Improved kspacebased mr thermometry by joint prf phase. Objectiveto compare the accuracy of a semiquantitative proton resonance frequency shift prfs thermal mapping interface and an alternative qualitative t1 thermometry model in predicting tissue necrosis in an established routine setting of mriguided laser ablation in the human liver. While conventional prfshift thermometry is based on calculating a phase difference between two reconstructed mr images, gaur et al 1,2 have recently described two algorithms that estimate temperature. Jun 01, 2004 the proton resonance frequency prf shift provides a means of measuring temperature changes during minimally invasive thermotherapy. Modelbased prfs thermometry using fat as the internal. Referenceless mr thermometry during canine prostate ablation.
Magnetic resonance temperature imaging for guidance of thermotherapy. Thermometry and ablation monitoring with ultrasound. Quantitative mr thermometry based on phasedrift correction prf. Monte carlo simulations demonstrate that the method provides optimal waterfat separation and improves the temperature estimation precision. The proton resonance frequency prf shift method has become the prevalent technique for mr thermometry. Prfshift mr thermometry is a promising tool for guiding thermal therapies in organs such as the breast 1 and prostate, but is complicated by motion and timevarying main field changes. In this study, phasedrift correction prfs with firstorder. A computationally efficient realtime hybrid mr thermometry. Figures hybrid mrultrasound acquisition for multibaseline. Referenceless mr thermometrya comparison of five methods. Referenceless thermometry methods derive a reference phase image from the treatment image itself by assuming that in the absence of a hot spot, the image phase can be accurately represented in a smooth usually low order polynomial basis. Noninvasive magnetic resonance thermometry mrt at lowfield using proton resonance frequency shift prfs is a promising technique for monitoring ablation temperature, since lowfield mr scanners with openconfiguration are more suitable for interventional procedures than closed systems. K 2010a reweighted l1 referenceless prf shift thermometry magn.
May 24, 2004 the proton resonance frequency prf shift provides a means of measuring temperature changes during minimally invasive thermotherapy. Referenceless mr thermometry to monitor tissue heating. Us8482285b2 us09,318 us201109318a us8482285b2 us 8482285 b2 us8482285 b2 us 8482285b2 us 201109318 a us201109318 a us 201109318a us 8482285 b2 us8482285 b2 us 8482285b2 authority us united states prior art keywords baseline image images phase treatment prior art date 20100119 legal status the legal status is an. Referenceless prf shift thermometry typically uses gradient echo gre images as input data.
Rieke v, vigen kk, sommer g, daniel bl, pauly jm, butts k. Hybrid multibaseline and referenceless prf shi ft thermometry using both water and fat images. Towards fast and accurate temperature mapping with proton resonance frequencybased mr thermometry. Evaluation of mr thermometry with proton resonance. Accelerated modelbased proton resonance frequency shift. However, conventional prf thermometry relies on the subtraction of baseline images, which makes it sensitive to tissue motion and frequency drift during the course of treatment. Request pdf referenceless prf shift thermometry the proton resonance frequency prf shift provides a means of measuring temperature changes. Reweightedl1 referenceless prf shift temperature estimation. For temperature monitoring in moving organs, such as the liver and the heart, problems with motion must be addressed. From this paper pubmed link and this abstract pdf link and this paper ieee xplore pdf link. Prf shift mr thermometry is a promising tool for guiding thermal therapies in organs such as the breast 1 and prostate, but is complicated by motion and timevarying main field changes. The method uses fat as a reference to improve estimates of the main field phase shift component of the hybrid image model. Temperature estimation in proton resonance frequency prf shift mr thermometry requires a reference, or pretreatment, phase image that is.
However, if the referenceless method is used to determine temperature changes during prostate ablation, phase gaps between water. We call this method referenceless prf shift thermometry. Based selfadaptive hybrid magnetic resonance thermometry yuxin zhang, shuo chen, kexin deng, bingyao chen, xing wei, jiafei yang, shi wang, and kui ying abstractto develop a selfadaptive and fast thermometry method by combining the original hybrid magnetic resonance thermometry method and the bio heat transfer equation bhte model. Temperature estimation in proton resonance frequency prf shift mr thermometry requires a reference, or pretreatment, phase image that is subtracted from. However, if the referenceless method is used to determine temperature changes during prostate ablation, phase gaps between water and fat in image regions used to determine the. In this study, a new method is presented that eliminates these problems by.
Request pdf referenceless prf shift thermometry the proton resonance frequency prf shift provides a means of measuring temperature changes during minimally invasive thermotherapy. Breathing motion creates phase shifts that may corrupt temperature measurements, and two main approaches have been proposed to handle such motion. Proton resonance frequency prfshift mr thermometry is a promising technique for guiding ablative treatment of heart arrhythmias, but is complicated by heart motion and respiration. In this paper, a hybrid method for prf thermometry in moving organs is presented that combines the strengths of referenceless and multi. Referenceless prf shift thermometry wiley online library. Introduction proton resonance frequency prf1 is the most commonlyused mr thermometry method, mostly because its. Abstract the proton resonance frequency prf shift provides a means of measuring. Kalman filtered bio heat transfer model based self. Root flip multiband rf and matchedphase excitation.
Quantitative mr thermometry based on phasedrift correction. Thermometry thermometry is the science and practice of temperature measurement. Radial basis function interpolation for referenceless. Materials and methods34 cases of prfsguided gre laser ablation were.
The hybrid image model assumes that three sources contribute to image phase during thermal treatment. Referenceless prf shift thermometry v rieke, kk vigen, g sommer, bl daniel, jm pauly, k butts magnetic resonance in medicine. Hybrid referenceless and multibaseline subtraction mr. Poster presentation open access improved kspacebased mr.
Guide on secondary thermometry thermistor thermometry 5 19 compensated by a similar t term in the carrier mobilities due to the density of states for phonons that scatter the carriers. Conventional prf thermometry works subtracting one or multiple baseline images. An extension to the referenceless method allows temperature estimation in the presence of phase discontinuities that occur at waterfat interfaces between. Software grissom lab at vanderbilt university vanderbilt. In the presence of therapyinduced temperature change, a hot spot appears in the phase, since proton resonance frequency decreases with increasing temperature. Thermometry is the science and practice of temperature measurement. The proton resonance frequency prf shift provides a means of measuring temperature changes during minimally invasive thermotherapy. Methods multibaseline thermometry requires reference data to be acquired, without cooling or heating, to provide a phase reference. Request pdf reweighted l1 referenceless prf shift thermometry temperature estimation in proton resonance frequency prf shift mr thermometry requires a reference, or pretreatment, phase image. Kalman filtered bio heat transfer model based selfadaptive. Towards fast and accurate temperature mapping with proton.
Hybrid multibaseline and referenceless prfshift temperature estimation. May 17, 2006 referenceless proton resonance frequency prf shift thermometry provides a means to measure temperature changes during minimally invasive thermotherapy that is inherently robust to motion and tissue displacement. Considering this, in classical prf shift thermometry there are obvious problems of artefacts, most prevalently due to motion, and in referenceless thermometry the accuracy of the interpolation lacks precision, radial basis function rbf approach can be applied to these thermometry issues. Evaluation of mr thermometry with proton resonance frequency.
Proton resonance shift of water in the gas and liquid states. The prf method relies on the subtraction of intratreatment phase images from that of a pretreatment baseline phase image, making it very sensitive to motion and magnetic field changes. Journal of cardiovascular magnetic resonance biomed central. Referenceless prf shift thermometry rieke 2004 magnetic. Applications of imaging processing to mrgfus treatment for. Reweighted l1 referenceless prf shift thermometry request pdf. Ipems aim is to promote the advancement of physics and engineering applied to medicine and biology for the public benefit.
Jan 21, 2010 proton resonance frequency prf shift mr thermometry is a promising technique for guiding ablative treatment of heart arrhythmias, but is complicated by heart motion and respiration. The aim of this contribution is to propose a novel background phase reconstruction method using radial basis function rbf interpolation. Aug 30, 2010 in this paper, a hybrid method for prf thermometry in moving organs is presented that combines the strengths of referenceless and multi. Background anatomical phase, spatially smooth phase deviations, and focal. Techniques to overcome the challenges in performing simple subtractionbased thermometry include the referenceless method of thermometry and multibaseline mr thermometry 22,23. Compared to conventional multibaseline thermometry, the inclusion of ocm signals into the reconstruction chain led to improved prf measurements in the presence of free breathing. Referenceless prf shift thermometry referenceless prf shift thermometry rieke, viola.
Referenceless thermometry using radial basis function. This article introduces an approach to reference prf shift thermometry that uses reweighted. Probability density functions pdf of the error distribution for these methods in. Rieke v, vigen k, sommer g, daniel b, pauly j, butts k. While conventional prfshift thermometry is based on calculating a phase difference between two reconstructed mr images, gaur et al 1, 2 have recently described two algorithms that estimate temperatureinduced phase shifts directly from mr kspace data, prior to image reconstruction. Two techniques have been proposed and used to address motion. An extension to the referenceless method allows temperature estimation in the presence of phase discontinuities that occur at waterfat interfaces between prostate and periprostatic. Accelerated modelbased proton resonance frequency shift temperature mapping using echobased grappa reconstruction. Proton resonance frequency shift prfs mr thermometry is commonly used to measure temperature in thermotherapy. After excitation in a gre sequence, magnetization phase evolves as the integral of frequency offset.
A selfreference prfshift mr thermometry method utilizing. Abstract the proton resonance frequency prf shift provides a means of measuring temperature changes during minimally invasive. The method requires a baseline temperature map and is therefore motion sensitive. Hybrid multibaseline and referenceless prfshi ft thermometry using both water and fat images. Comparison of single and multiecho prf shift thermometry and method for penalizedlikelihood multiecho temperature reconstruction pooja gaur1,2 and william a grissom 2,3 1chemical and physical biology, vanderbilt university, nashville, tennessee, united states, 2institute of imaging science, vanderbilt university, nashville, tennessee. Pdf the proton resonance frequency shift prfs method is the most. Application of hybrid mrultrasound imaging to multibaseline thermometry peihsin wu 1, chengchieh cheng, frank preiswerk1, bruno madore1 1department of radiology, brigham and womens hospital, harvard medical school, boston, ma, united states. Hybrid multibaseline and referenceless prfshi ft thermometry. Neglecting global offsets, the phase of the reconstructed image. An effective method for monitoring tissue temperature. To address motion, multibaseline subtraction techniques have been proposed 1,2 that use a library of pretreatment baseline images covering the cardiac and.
Grissom wa, lustig m, holbrook ab, rieke v, pauly jm, buttspauly k. The proton resonance frequency prf shift provide a method for temperature change measurements during thermotherapy. Referenceless mr thermometry during canine prostate. Grissom wa1, lustig m, holbrook ab, rieke v, pauly jm, buttspauly k. Hybrid multibaseline and referenceless prfshift thermometry. Magnetic resonance thermometry using the proton resonance frequency prf shift is a promising technique for guiding thermal ablation. Techniques for temperature measurement and corrections in longterm magnetic resonance thermometry download pdf info publication number ep2467729b1. Hybrid referenceless and multibaseline subtraction.
Ep2467729b1 techniques for temperature measurement and. The effectiveness of the method has been demonstrated by comparing it against the classical prf. Jun 30, 2015 while conventional prf shift thermometry is based on calculating a phase difference between two reconstructed mr images, gaur et al 1, 2 have recently described two algorithms that estimate temperatureinduced phase shifts directly from mr kspace data, prior to image reconstruction. Referenceless thermometry aims to reduce artefacts caused by tissue motion and frequency drift, fitting the background phase outside the heated region. Methods and potentials of magnetic resonance imaging for monitoring radiofrequency hyperthermia in a hybrid system. Us8482285b2 multibaseline prfshift magnetic resonance.
Modelbased prfs thermometry using fat as the internal reference and the extended prony algorithm for model fitting. In this study, phasedrift correction prfs with firstorder polynomial fitting method was proposed. Proton resonance frequency shift prfs mr thermometry is commonly. Prf shift thermometry typically uses gre images as input data although spinecho images have also been used 2, and temperature is estimated from image phase.
Daniel, bruce l pauly, john m butts, kim 20040601 00. Reweighted 1 referenceless prf shift thermometry europe pmc. Multibaseline subtraction techniques have been proposed, which use a library of baseline images. The method leads to artifacts caused by tissue motion and frequency drift. Samples are prepared by a standard ceramic technique. Several referenceless mr thermometry methods were proposed to address this problem but their performances have never been compared. The combination of the effects gives an overall resistancetemperature behaviour that is well approximated by r t r e kt exp 2 0 g, 2. A modelbased prfs temperature mapping method was developed using fat as an internal reference, and the extended prony algorithm was used for the model fitting. Based selfadaptive hybrid magnetic resonance thermometry yuxin zhang, shuo chen, kexin deng, bingyao chen, xing wei, jiafei yang, shi wang, and kui ying. In conventional prf shift thermometry, phase images acquired prior to heating i.
Reweighted 1 referenceless prf shift thermometry europe. Request pdf reweighted l1 referenceless prf shift thermometry temperature estimation in proton resonance frequency prf shift mr thermometry requires a. While conventional prf shift thermometry is based on calculating a phase difference between two reconstructed mr images, gaur et al 1,2 have recently described two algorithms that estimate temperature. Furthermore, prf shift thermometry is challenging to apply in the abdomen due to the proximity of the lungs and subsequent motion of organs due to respiration. Pdf an enhanced hybrid mri thermometry technique for.
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