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Multiplanar MR temperature-sensitive imaging of cerebral thermal treatment using interstitial ultrasound applicators in a canine model

Kangasniemi, Marko; Diederich, Chris J; Price, Roger E; Stafford, R Jason; Schomer, Donald F; Olsson, Lars E LU ; Tyreus, Per Daniel; Nau, Will H and Hazle, John D (2002) In Journal of Magnetic Resonance Imaging 16(5). p.31-522
Abstract

PURPOSE: To study the feasibility of an interleaved gradient-echo, echo-planar imaging (iGE-EPI) sequence for multiplanar magnetic resonance temperature imaging (MRTI) to monitor intracerebral thermal treatment three-dimensionally using multielement ultrasound applicators.

MATERIALS AND METHODS: Transmissible venereal tumor (TVT) fragments were injected into the right cerebral hemisphere of five dogs. Guided by MRI, an interstitial ultrasound applicator was inserted into the tumor or normal brain tissue. The iGE-EPI sequence was used to estimate temperature changes by computing the complex phase-difference induced by temperature-dependent shifts in the proton resonance frequency of water. The thermal dose maps were updated every... (More)

PURPOSE: To study the feasibility of an interleaved gradient-echo, echo-planar imaging (iGE-EPI) sequence for multiplanar magnetic resonance temperature imaging (MRTI) to monitor intracerebral thermal treatment three-dimensionally using multielement ultrasound applicators.

MATERIALS AND METHODS: Transmissible venereal tumor (TVT) fragments were injected into the right cerebral hemisphere of five dogs. Guided by MRI, an interstitial ultrasound applicator was inserted into the tumor or normal brain tissue. The iGE-EPI sequence was used to estimate temperature changes by computing the complex phase-difference induced by temperature-dependent shifts in the proton resonance frequency of water. The thermal dose maps were updated every 6-8 seconds for five to seven image planes during treatment. The results of MRTI were compared with those of post-treatment MRI and histologic analysis.

RESULTS: The multiplanar MRTI monitored temperature and thermal dose distributions in tumor and normal brain tissue over the entire user-defined treatment volume. The ultrasound applicators produced contiguous areas of coagulative necrosis, resulting in 1.5-4.0 cm(3) volumes of tissue necrosis. MRTI-based assessments of thermal-dose distributions were consistent with the results of post-treatment MRI and histologic analysis.

CONCLUSION: Multiplanar MRTI is feasible for measuring necrosing thermal doses during intracerebral thermal delivery by interstitial ultrasound applicators.

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author
publishing date
type
Contribution to journal
publication status
published
keywords
Animals, Brain, Brain Neoplasms, Contrast Media, Dogs, Echo-Planar Imaging, Feasibility Studies, Gadolinium, Imaging, Three-Dimensional, Magnetic Resonance Imaging, Male, Monitoring, Physiologic, Necrosis, Neoplasm Transplantation, Temperature, Ultrasonic Therapy
in
Journal of Magnetic Resonance Imaging
volume
16
issue
5
pages
10 pages
publisher
John Wiley & Sons
external identifiers
  • Scopus:0036829966
ISSN
1053-1807
DOI
10.1002/jmri.10191
language
English
LU publication?
no
id
9f661ac6-88dd-48ad-b378-b2b8f841be51
date added to LUP
2016-08-16 12:12:55
date last changed
2016-10-13 05:12:17
@misc{9f661ac6-88dd-48ad-b378-b2b8f841be51,
  abstract     = {<p>PURPOSE: To study the feasibility of an interleaved gradient-echo, echo-planar imaging (iGE-EPI) sequence for multiplanar magnetic resonance temperature imaging (MRTI) to monitor intracerebral thermal treatment three-dimensionally using multielement ultrasound applicators.</p><p>MATERIALS AND METHODS: Transmissible venereal tumor (TVT) fragments were injected into the right cerebral hemisphere of five dogs. Guided by MRI, an interstitial ultrasound applicator was inserted into the tumor or normal brain tissue. The iGE-EPI sequence was used to estimate temperature changes by computing the complex phase-difference induced by temperature-dependent shifts in the proton resonance frequency of water. The thermal dose maps were updated every 6-8 seconds for five to seven image planes during treatment. The results of MRTI were compared with those of post-treatment MRI and histologic analysis.</p><p>RESULTS: The multiplanar MRTI monitored temperature and thermal dose distributions in tumor and normal brain tissue over the entire user-defined treatment volume. The ultrasound applicators produced contiguous areas of coagulative necrosis, resulting in 1.5-4.0 cm(3) volumes of tissue necrosis. MRTI-based assessments of thermal-dose distributions were consistent with the results of post-treatment MRI and histologic analysis.</p><p>CONCLUSION: Multiplanar MRTI is feasible for measuring necrosing thermal doses during intracerebral thermal delivery by interstitial ultrasound applicators.</p>},
  author       = {Kangasniemi, Marko and Diederich, Chris J and Price, Roger E and Stafford, R Jason and Schomer, Donald F and Olsson, Lars E and Tyreus, Per Daniel and Nau, Will H and Hazle, John D},
  issn         = {1053-1807},
  keyword      = {Animals,Brain,Brain Neoplasms,Contrast Media,Dogs,Echo-Planar Imaging,Feasibility Studies,Gadolinium,Imaging, Three-Dimensional,Magnetic Resonance Imaging,Male,Monitoring, Physiologic,Necrosis,Neoplasm Transplantation,Temperature,Ultrasonic Therapy},
  language     = {eng},
  number       = {5},
  pages        = {31--522},
  publisher    = {ARRAY(0x9016a70)},
  series       = {Journal of Magnetic Resonance Imaging},
  title        = {Multiplanar MR temperature-sensitive imaging of cerebral thermal treatment using interstitial ultrasound applicators in a canine model},
  url          = {http://dx.doi.org/10.1002/jmri.10191},
  volume       = {16},
  year         = {2002},
}