Magnetic resonance thermometry for predicting thermal damage: An application of interstitial laser coagulation in an in vivo canine prostate model

Peters, Robert; Chan, Eric K.; Trachtenberg, John; Jothy, Serge; Kapusta, Linda; Kucharczyk, Walter; Henkelman, R. Mark

doi:10.1002/1522-2594(200012)44:6<873::aid-mrm8>3.0.co;2-x

Cited by 124 publications

(103 citation statements)

References 30 publications

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“…However, there is evidence, both in the literature and from our data, that the critical temperature is tissue-dependent. For example, in vivo experiments in canine prostate yielded lower values of T c ϭ 51°C (20), whereas our own preliminary MCS results for human brain gray and white matter suggest critical temperatures of around 56°C.…”

Section: Discussioncontrasting

confidence: 60%

“…Animal studies have shown that the histologically determined lesion boundaries do not exactly match the contrast-enhanced rim on the MR images. In addition, the extent of the MRI lesion immediately after LITT is greater than that determined during followup, the reduction being on the order of Ϸ20% (20,39). In our case, the diameter of the induced lesion was estimated by visual inspection only.…”

Section: Discussionmentioning

confidence: 56%

“…As regards the accuracy of PRF thermometry, a value around 1°C is currently considered as a practical lower limit (20). Our MR thermometry was tested in vitro on bovine and porcine tissue samples and yielded a temperature accuracy of Ϸ3°C.…”

Section: Discussionmentioning

confidence: 99%

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Simulations of thermal tissue coagulation and their value for the planning and monitoring of laser‐induced interstitial thermotherapy (LITT)

Puccini

Bär

Bublat

et al. 2003

Magnetic Resonance in Med

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Section: Discussioncontrasting

confidence: 60%

Section: Discussionmentioning

confidence: 56%

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Simulations of thermal tissue coagulation and their value for the planning and monitoring of laser‐induced interstitial thermotherapy (LITT)

Puccini

Bär

Bublat

et al. 2003

Magnetic Resonance in Med

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“…The non−contact temperature measurement of a tissue can be done with the use of thermovision cameras, special pyrometer systems or MRI technique [4,8].…”

Section: Introductionmentioning

confidence: 99%

Procedures of optical control dedicated for laser welding process of biological tissues

Zając

Podniesiński

Świderski

et al. 2010

Opto-Electronics Review

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In this contribution, an optical method of controlling the state of soft biological tissues in real time exposed to laser radiation is discussed. The method is based on the assumption that the change dynamics of the amplitude of the scattered diagnostic radiation (λ = 635 nm) is compatible with the change dynamics of the tissue inner structure exposed to the Nd:YAG laser radiation (λ = 1064 nm). In this method, the measurement of the tissue temperature is omitted. Exemplary results of the laboratory research on this method and an interpretation of the results are presented.

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“…Currently, the most accurate MR thermometric methods employ the water proton resonance frequency (PRF) shift using MR phase maps (1)(2)(3)(4). All current PRFbased approaches employ fast gradient echo sequences, usually on high field MR scanners (Ն1.5 T).…”

mentioning

confidence: 99%

Use of fast spin echo for phase shift magnetic resonance thermometry

Vogel

Pattynama

Lethimonnier

et al. 2003

Magnetic Resonance Imaging

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Purpose: To propose a modified fast spin echo (FSE) magnetic resonance imaging sequence for MR thermometry, employing the proton resonance frequency (PRF) shift by means of MR phase maps. Despite their obvious advantages of speed and high signal-to-noise ratio (SNR), FSE sequences have not until now been used for this purpose due to the restraints imposed by the Carr-Purcell-Meiboom-Gill (CPMG) conditions. Materials and Methods:The new FSE combines a new phase modulation scheme that maintains magnetization that ordinarily is destroyed under CPMG conditions, while employing conventional FSE gradient waveforms. The echoes are read in a single shot using 128 readouts in 650 msec, with a phase sensitive preparation using an optional time shift before the start of the refocusing gradient waveforms. This feature allows the quantification of temperature dependent phase shifts. We tested the sequence by imaging a heated agar gel phantom while cooling, using different values for . Results:There was good correlation between FSE and fiberoptic-based temperature measurements in the phantom(r 2 Ն 0.95). Temperature sensitivity could be adjusted by varying the value. Conclusion:With the proposed non-CPMG FSE sequence it is feasible to quantify temperature changes by means of the PRF shift.

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Magnetic resonance thermometry for predicting thermal damage: An application of interstitial laser coagulation in an in vivo canine prostate model

Cited by 124 publications

References 30 publications

Simulations of thermal tissue coagulation and their value for the planning and monitoring of laser‐induced interstitial thermotherapy (LITT)

Simulations of thermal tissue coagulation and their value for the planning and monitoring of laser‐induced interstitial thermotherapy (LITT)

Procedures of optical control dedicated for laser welding process of biological tissues

Use of fast spin echo for phase shift magnetic resonance thermometry

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