Jean-Yves Chapelon

David Melodelima2
Michel Rivoire2
Albert Gelet2
Olivier Rouviere2
2David Melodelima
2Michel Rivoire
2Albert Gelet
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Vibro-acoustography method is explored for detecting and imaging brachytherapy metal seeds in gel phantoms. In a previous paper, we have shown that some immersed objects' resonance frequencies could be detected by vibro-acoustography. Here, we use this idea to optimize the vibro-acoustic excitation of two different sized brass seeds implanted in an agar gel(More)
Elastography is an imaging technique based on strain estimation in soft tissues under quasi-static compression. The stress is usually created by a compression plate, and the target is imaged by an ultrasonic linear array. This configuration is used for breast elastography, and has been investigated both theoretically and experimentally. Phenomena such as(More)
BACKGROUND Surgery is the only curative treatment in patients with colorectal liver metastases (CLM), but only 10-20% of patients are eligible. High Intensity Focused Ultrasound (HIFU) technology is of proven value in several indications, notably prostate cancer. Its intra-operative use in patients with CLM has not previously been studied. Preclinical work(More)
Objectives: To evaluated the efficacy of Focal One device for focal treatment of localized prostate cancer. Methods Material and method: Focal One ® is a device designed for the focal therapy of Prostate Cancer combing the necessary tools to visualize, target, treat and validate the focal treatment. MR volumes are imported through the hospital's network.(More)
  • Albert Gelet, Sebastien Crouzet, Olivier Rouviere, Jean-Yves Chapelon, Murielle Rabilloud
  • 2015
Radical prostatectomy is the gold standard treatment for localized prostate cancer. HIFU is a treatment option with promising outcomes. No randomized study is available to compare those techniques. The goal of the study was to evaluate the oncologic outcome of patients treated with HIFU and radical prostatectomy by using a matched pair analysis to compare(More)
Background/introduction Managing colorectal liver metastases (CLM) is a major clinical challenge, and surgery remains the only potentially curative treatment. Five-year survival rates of up to 51% have been recently reported. However, only 10-20% of patients are eligible for surgery, which is often precluded by the number, size and/or location of(More)
We investigated a technique based on phase-contrast cine MRI combined with deconvolution of the phase shift waveforms to measure rapidly varying pulsatile motion waveforms. The technique does not require steady-state displacement during motion encoding. Simulations and experiments were performed in porcine liver samples in view of a specific application,(More)
Unresectable liver tumors are often treated with interstitial probes that modify tissue temperature, and efficacious treatment relies on image guidance for tissue targeting and assessment. Here, we report the in vivo evaluation of an interstitial applicator with a mechanically oscillating five-element dual-mode transducer. After thoroughly characterizing(More)
The study investigates a new sonication strategy with high-intensity focused ultrasound (HIFU), aiming for improvement of the original Ablatherm procedure in the prostate cancer treatment. The currently implemented and clinically used method (defined as reference) uses a single-element transducer, operated with 60% duty cycle. To implement the novel(More)
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