Accuracy of MR phase mapping for temperature monitoring during interstitial laser coagulation (ILC) in the liver at rest and simulated respiration

Heisterkamp, Joos; Matheijssen, Niels A. A.; Hillegersberg, Richard van; Vaals, J. J. Van; Laméris, Johan S.; Stoker, J.; Jzermans, J. N. M. I.

doi:10.1002/(sici)1522-2594(199905)41:5<919::aid-mrm10>3.0.co;2-4

Cited by 21 publications

(9 citation statements)

References 25 publications

(19 reference statements)

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“…MR signals are influenced by a mixture of tissue effects (e.g., coagulation and perfusion) in addition to temperature changes (10,11). Therefore, investigators attempted to separate temperature as an observable in laser-induced thermotherapy (12)(13)(14)(15) and focused ultrasound (16,17), and elucidate the reliability and limitations of MR-guided thermography. Basically, three methods are available for MR thermography and are discussed in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…Temperature accuracies of MR-based thermography applied for ablation techniques are reported to be in the range F3jC to 4.5jC even under favorable in vitro conditions with liver specimens (12)(13)(14)33). Therefore, MR thermography during regional hyperthermia seems to be even more challenging because the expected temperature differences during such a heat treatment (37-43jC) are near the uncertainties referenced for high temperature applications.…”

Section: Introductionmentioning

confidence: 99%

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Noninvasive Magnetic Resonance Thermography of Recurrent Rectal Carcinoma in a 1.5 Tesla Hybrid System

Gellermann¹,

Wlodarczyk²,

Hildebrandt³

et al. 2005

Cancer Research

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To implement noninvasive thermometry, we installed a hybrid system consisting of a radiofrequency multiantenna applicator (SIGMA-Eye) for deep hyperthermia (BSD-2000/3D) integrated into the gantry of a 1.5 Tesla magnetic resonance (MR) tomograph Symphony. This system can record MR data during radiofrequency heating and is suitable for application and evaluation of methods for MR thermography. In 15 patients with preirradiated pelvic rectal recurrences, we acquired phase data sets (25 slices) every 10 to 15 minutes over the treatment time (60-90 minutes) using gradient echo sequences (echo time = 20 ms), transformed the phase differences to MR temperatures, and fused the color-coded MR-temperature distributions with anatomic T1-weighted MR data sets. We could generate one complete series of MR data sets per patient with satisfactory quality for further analysis. In fat, muscle, water bolus, prostate, bladder, and tumor, we delineated regions of interest (ROI), used the fat ROI for drift correction by transforming these regions to a phase shift zero, and evaluated the MR-temperature frequency distributions. Mean MR temperatures (T MR ), maximum T MR , full width half maximum (FWHM), and other descriptors of tumors and normal tissues were noninvasively derived and their dependencies outlined. In 8 of 15 patients, direct temperature measurements in reference points were available. We correlated the tumor MR temperatures with direct measurements, clinical response, and tumor features (volume and location), and found reasonable trends and correlations. Therefore, the mean T MR of the tumor might be useful as a variable to evaluate the quality and effectivity of heat treatments, and consequently as optimization variable. Feasibility of noninvasive MR thermography for regional hyperthermia has been shown and should be further investigated. (Cancer Res 2005; 65(13): 5872-80)

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Noninvasive Magnetic Resonance Thermography of Recurrent Rectal Carcinoma in a 1.5 Tesla Hybrid System

Gellermann¹,

Wlodarczyk²,

Hildebrandt³

et al. 2005

Cancer Research

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“…Thus, it is of decisive importance for the successful application of LITT to control the achieved therapeutic effects in the target region with suitable procedures. Experimental data show that MRI is an especially suitable monitoring procedure for laser-induced thermotherapy, because it is capable of showing thermal changes by altered signal behavior [15][16][17]. Under clinical conditions, MRI is also excellently suited as a real-time monitoring procedure for LITT of the liver [1,6].…”

Section: Discussionmentioning

confidence: 99%

Laserinduced thermotherapy (LITT) of experimental livermetastasis—detection of residual tumors using Gd‐DTPA enhanced MRI

et al. 2002

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“…From a previous study, a variation of temperature in the moving liver within range ±3. 5 o C was reported after 6 minutes of laser irradiation [4]. Considering the ideal value and a tolerable value to the unwanted phase shift was not fully eliminated, the variation of the background temperature within ±1.…”

Section: Experiments Proceduresmentioning

confidence: 99%

“…Spatially varying field deviations can not be distinguished from temperature changes, and therefore leads to reduced thermal accuracy. A previous study showed that a reproducible phase image can be created, when scanning was done in the same position [4]. To improve the temporal resolution of temperature measurement, an objective phase shift map must be determined from various scanning positions that occur in the respiratory cycle.…”

Section: Introductionmentioning

confidence: 99%

Displacement Correction Scheme for MR-Guided Interstitial Laser Therapy

Suprijanto

Vogel

Vos

et al. 2003

Lecture Notes in Computer Science

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Abstract. MR guided interstitial laser therapy can be used to monitor the extent of tumor tissue coagulation during thermal treatment based on a temperature map. In a non-stationary object that was influenced by respiratory motion, the temperature map may show errors due to incorrect spatial baseline images. Moreover, an unwanted phase shift due to object displacement contributes to errors in the temperature map, that must be suppressed. This paper describes a strategy which addresses the difficulties of MR guided interstitial laser therapy in the presence of respiratory motion. The multi-baseline images, supported by the displacement correction scheme, were used to improve the temporal resolution of a temperature map in the respiratory cycle. In the displacement correction scheme, the object coordinates that are provided by an active tracking coil were employed to support a matching strategy between the thermal and baseline images. To avoid errors in the temperature map due to the motion artifact, a detector of low quality images was proposed as part of the displacement correction scheme.

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Accuracy of MR phase mapping for temperature monitoring during interstitial laser coagulation (ILC) in the liver at rest and simulated respiration

Cited by 21 publications

References 25 publications

Noninvasive Magnetic Resonance Thermography of Recurrent Rectal Carcinoma in a 1.5 Tesla Hybrid System

Noninvasive Magnetic Resonance Thermography of Recurrent Rectal Carcinoma in a 1.5 Tesla Hybrid System

Laserinduced thermotherapy (LITT) of experimental livermetastasis—detection of residual tumors using Gd‐DTPA enhanced MRI

Displacement Correction Scheme for MR-Guided Interstitial Laser Therapy

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