In vivo laser‐induced interstitial thermotherapy of pig liver with a temperature‐controlled diode laser and MRI correlation

Wohlgemuth, Walter A.; G, Wamser; Reiß, Thomas; Wagner, T.; Bohndorf, Klaus

doi:10.1002/lsm.1131

Cited by 20 publications

(8 citation statements)

References 23 publications

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“…Earlier attempts to develop a feedback system to regulate laser power and reduce the risk of excess heating during LITT have been based on the measurement of temperatures using thermocouples built into the fiber tip or the monitoring of the water-cooling system of the laser fiber [19,20]. The advantage of those systems is a continuous real-time temperature measurement.…”

Section: Discussionmentioning

confidence: 99%

Thermal therapy of canine cerebral tumors using a 980 nm diode laser with MR temperature‐sensitive imaging feedback

et al. 2004

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Section: Discussionmentioning

confidence: 99%

Thermal therapy of canine cerebral tumors using a 980 nm diode laser with MR temperature‐sensitive imaging feedback

et al. 2004

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“…The unique ability of the MRI is the capability of monitoring thermal changes in tissue. This is not possible to the same extent with CT or ultrasound, as only MRI can provide quantitative information about thermal changes in tissue [35,36,37,38,39]. Generally, high-field devices are more suitable for thermal monitoring because of better signalto-noise ratio; however, the high-field devices lack the patient access that open scanners possess.…”

Section: Discussionmentioning

confidence: 94%

MR imaging-guided laser ablation of osteoid osteomas with use of optical instrument guidance at 0.23�T

et al. 2003

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The purpose of this study was to determine the feasibility and features of low-field MR imaging in performing interstitial laser ablation of osteoid osteomas. Between September 2001 and April 2002, five consecutive patients with clinical and imaging findings suggesting osteoid osteoma and referred for removal of osteoid osteoma were treated with interstitial laser treatment. A low-field open-configuration MRI scanner (0.23 T, Outlook Proview, Philips Medical Systems, Finland) with optical instrument guidance hardware and software was used. Laser device used was of ND-Yag type (Fibertom medilas, Dornier Medizin Technik, Germany). A bare laser fiber (Dornier Medizin Technik, Germany) with a diameter of 400 microm was used. Completely balanced steady-state (CBASS; true fast imaging with steady precession) imaging was used for lesion localization, instrument guidance, and thermal monitoring. A 14-G (Cook Medical, USA) bone biopsy drill was used for initial approach. Laser treatment was conducted through the biopsy canal. All the lesions were successfully localized, targeted, and treated under MRI guidance. All the patients were symptom free 3 weeks and 3 months after the treatment. There was one recurrence reported during follow-up (6 months). The MRI-guided percutaneous interstitial laser ablation of osteoid osteomas seems to be a feasible treatment mode.

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“…[15] is traditionally defined over the range (-/2, /2), yet the phase angle defined by the real and imaginary components can be expressed on the range (-, ), the application of special conditions (Eqs. [5]- [8] and [11] - [13]) to the pixel-by-pixel difference of four-quadrant arctangents (Eqs. [9] and [10]) will allow an absolute phase change of Ϯ to be reconstructed without the aid of a temporal history.…”

Section: Discussionmentioning

confidence: 99%

Variation correction algorithm: Analysis of phase suppression and thermal profile fidelity for proton resonance frequency magnetic resonance thermometry at 0.2 T

Barkauskas¹,

Lewin²,

Duerk³

2003

Magnetic Resonance Imaging

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Purpose: To develop and analyze the performance of the variation correction algorithm (VCA), a phase correction technique that mitigates the contribution of background phase variations by combining accurate alignment of echoes, K-space-based phase correction (as opposed to spatial polynomials), and extraction of alias-free phase difference images. Materials and Methods:A series of echo-shifted gradientrecalled echo (GRE) images was processed with K-space alignment and phase corrected with increasing sizes of M ϫ M masks of central K-space coefficients. The extent of background phase variation suppression due to magnet field drift was assessed. Further, a simulated thermal profile was superimposed on the same data in a related experiment. Residual errors in reconstructed simulated thermal profiles were quantitatively characterized to estimate algorithm performance.Results: Using a 3 ϫ 3 K-space mask, the VCA was able to 1) maintain the typical mean backround error in a 35 ϫ 35 pixel region of interest (ROI) at -0.1°C; and 2) reconstruct, relative to the applied thermal profile, a phase-corrected profile that typically contains a 1.7°C underestimation of peak temperature difference and a mean error along the 60°C line of -0.8°C. Conclusion:The results suggest that thermal profiles can be accurately reconstructed at 0.2 T using the VCA, even in the presence of over 1 ppm spatially and temporally dependent field drift over a 1-hour time frame.

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In vivo laser‐induced interstitial thermotherapy of pig liver with a temperature‐controlled diode laser and MRI correlation

Abstract: LITT carried out with the Diode laser provides reproducible necroses of pig liver in vivo. MR-imaging results compared favorably with those obtained by pathologic specimens.

Cited by 20 publications

References 23 publications

Thermal therapy of canine cerebral tumors using a 980 nm diode laser with MR temperature‐sensitive imaging feedback

Thermal therapy of canine cerebral tumors using a 980 nm diode laser with MR temperature‐sensitive imaging feedback

MR imaging-guided laser ablation of osteoid osteomas with use of optical instrument guidance at 0.23�T

Variation correction algorithm: Analysis of phase suppression and thermal profile fidelity for proton resonance frequency magnetic resonance thermometry at 0.2 T

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