High-resolution MR imaging appearance of colonic tissue in rabbits using an endoluminal coil

Pilleul, F.; Beuf, Olivier; Godefroy, Claire; Scoazec, Jean‐Yves; Armenean, M.; Armenean, C.; Perrin, Emmanuel; Valette, Pierre-Jean; Jalmes, H. Saint

doi:10.1007/s10334-005-0008-9

Cited by 3 publications

(3 citation statements)

References 15 publications

(16 reference statements)

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“…At clinical field strength, imaging of small regions of interest obtained from endoluminal coils exhibits a higher signal‐to‐noise ratio than with external coils (5). Applications such as high‐resolution imaging of the colon or esophagus walls could be highly useful for clinicians (6). On another part, in several diagnosis or therapeutic procedures, patients could have metallic implants (pacemaker), electrodes (eg deep EEG, stimulation electrodes), or catheter, with in some cases a part of it in the patient's body and the other part outside the patient.…”

Section: Introductionmentioning

confidence: 99%

Assessment of radiofrequency self‐heating around a metallic wire with MR T1‐based thermometry

Detti¹,

Grenier²,

Perrin³

et al. 2011

Magnetic Resonance in Med

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Heat produced by a magnetic resonance (MR) imaging sequence in the vicinity of a conductive wire (pacemaker, electrodes, or catheter), is a subject of interest for the assessment of patient safety during imaging. For this purpose, the measurement of temperature rises during an MR imaging sequence using MR T 1 -based thermometry provides several advantages, mainly in its ability to retrieve in situ realtime thermal maps. Recent studies investigated the heat produced by an independent radiofrequency pulse, assessing MR imaging sequence heating using a specific MR thermometry sequence. This study focuses on self-heating for which the radiofrequency pulses used for measuring temperature create the heat. An experimental design was set up to evaluate T 1 -based thermometry self-heating using a coupled/decoupled wire and to compare it with a reference temperature gathered by an optical fiber device. For the tested experimental set up, T 1 -based thermometry is in fairly good agreement with optical fiber reference temperature. Magn Reson Med 66:448-455,

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Section: Introductionmentioning

confidence: 99%

Assessment of radiofrequency self‐heating around a metallic wire with MR T1‐based thermometry

Detti¹,

Grenier²,

Perrin³

et al. 2011

Magnetic Resonance in Med

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“…A rectangular single loop coil was designed using a 35 µm-thick copper trace (width w = 5.1 mm, and length l = 47 mm on a FR4 substrate (relative permittivity r = 4, thickness t = 0.8 mm). Previous in vivo works (Armenean et al 2004, Pilleul et al 2005 have demonstrated that such size and geometry of the loop enable the depiction of bowel abnormalities by imaging the colon wall layers with an adequate penetration depth and a high in-plane spatial resolution. Figure 1 shows the photograph and the electric circuit of the different used coils.…”

Section: Coils Prototypesmentioning

confidence: 99%

“…Indeed, despite the huge progresses in radiofrequency (RF) coils, based on the phased array technology with increase of channels (Giusti et al 2012), the external MRI coils have remained unable to provide adequate SNR to reach required high spatial resolution images. By comparison several authors have demonstrated that internal coils significantly increase the local SNR and makes possible either to perform fast in vivo MR spectroscopy of heart tissues or to obtain high spatial resolution MR images of colon walls in preclinical context , Dorez et al 2016, Kantor et al 1984, Pilleul et al 2005, Ramgolam et al 2011.…”

Section: Introductionmentioning

confidence: 99%

Active optical-based detuning circuit for receiver endoluminal coil

Saniour¹,

Aydé²,

Perrier³

et al. 2017

Biomed. Phys. Eng. Express

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In this paper we demonstrate the effectiveness of an active optical detuning circuit for magnetic resonance imaging (MRI) endoluminal receiver coil. Three endoluminal coils prototypes were built: a coil without any detuning circuit, a coil with a galvanic (classic) detuning circuit using a PIN diode, and a coil with an optical detuning circuit using two photodiodes in parallel with a PIN diode. These coils were built and characterized on a laboratory experimental bench. Then, an in vitro experiment was performed with a 3.0 T MR system to evaluate the impact of the endoluminal receiver coils in detuned phase on the image uniformity distribution measured using the body coil. Next, the endoluminal coil was used as a receiver coil to compare the signal-to-noise ratio (SNR) distribution based on iso-contour maps. On experimental bench, the results show an increase delay of the switching times (tuned-detuned or detuned-tuned) for optical-detuned coils of about 10 µs due to the electro-optical circuits, delay still compatible with requirements. When the body coil is used as a transceiver, the SNR uniformity is similar whether the galvanic or the optical detuning circuit is used. Finally, the SNR iso-contours of the different endoluminal coils prototypes are comparable.

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Endoluminal high-resolution MR imaging protocol for colon walls analysis in a mouse model of colitis

Dorez

Sablong

Canaple

et al. 2016

Magn Reson Mater Phy

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High-resolution MR imaging appearance of colonic tissue in rabbits using an endoluminal coil

Abstract: Dedicated endoluminal RF coil provides good spatial resolution at the region of interest. On this prospective study of in vivo rabbit, evaluation of colon walls allowed to provide detailed information.

Cited by 3 publications

References 15 publications

Assessment of radiofrequency self‐heating around a metallic wire with MR T1‐based thermometry

Assessment of radiofrequency self‐heating around a metallic wire with MR T1‐based thermometry

Active optical-based detuning circuit for receiver endoluminal coil

Endoluminal high-resolution MR imaging protocol for colon walls analysis in a mouse model of colitis

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