Non-invasive temperature imaging of muscles with magnetic resonance imaging using spin-echo sequences

Mietzsch, E.; Koch, M.; Schaldach, M.; Werner, J.; Bellenberg, Barbara; Wentz, K. U.

doi:10.1007/bf02518868

Cited by 13 publications

(7 citation statements)

References 23 publications

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“…We found a significant influence of temperature on the T 1 of bone marrow in the equine distal limb. The linear relationship between the T 1 relaxation time and temperature that we found has also been found by others . In one assessment, the effect was 5–10 ms/°C .…”

Section: Discussionsupporting

confidence: 89%

The Influence of Temperature and Age on the T1 Relaxation Time of the Equine Distal Limb

Adrian

Koene²,

Roberts³

et al. 2012

Vet Radiology Ultrasound

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The extent of fat suppression using short tau inversion recovery (STIR) imaging is variable between horses. Our aim was to determine if patient's age and/or hoof temperature have an influence on the T(1) relaxation time of bone marrow in the equine distal limb, thereby affecting the suppression of fat signal. Magnetic resonance imaging was conducted on standing horses and cadaver samples using a low-field magnet (0.27 T). The hoof temperature was measured at the lateral side of the coronary band. A modified inversion recovery fast spin-echo (IR-FSE) sequence was used to measure the signal intensity for a range of inversion times (TIs) at six different regions of interest (ROI): (1) distal aspect of the proximal phalanx, (2) proximal aspect of the middle phalanx, (3) distal aspect of the middle phalanx, (4) navicular bone, (5) proximal aspect of the distal phalanx, and (6) distal aspect of the distal phalanx. The T(1) of the bone marrow in the equine distal limb was calculated from the results and was found to increase by 3.13 ± 0.08 (SE) ms/°C. There was no significant effect of age (2-16 years) but the T(1) values measured from the limbs of young (< 1 year) animals were considerably longer (32.6 ± 1.7 (SE) ms). Similar effects of temperature and age were found for all measured ROIs but there were significant differences in the mean values of T(1) , ranging from +7.7 (distal aspect of the distal phalanx) to -13.2 ms (distal aspect of the proximal phalanx).

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Section: Discussionsupporting

confidence: 89%

The Influence of Temperature and Age on the T1 Relaxation Time of the Equine Distal Limb

Adrian

Koene²,

Roberts³

et al. 2012

Vet Radiology Ultrasound

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“…To choose a suitable substitute for soft tissues and compare signal intensities with the test liquids, we conducted a preparatory study. There was a study which reported in vitro experiments performed on a meat sample as a substitute for imaging the human body by MRI . We selected, however, a fish sausage, a chicken sausage, a pork sausage and a stick of cheese as candidate substitutes for soft tissues because all of them could be eaten plain.…”

Section: Discussionmentioning

confidence: 99%

Optimal contrast enhancement liquid for dynamic MRI of swallowing

Ohkubo

Higaki

Nishikawa

et al. 2016

J of Oral Rehabilitation

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Several dynamic magnetic resonance imaging (MRI) techniques to observe swallowing and their parameters have been reported. Although these studies used several contrast enhancement liquids, no studies were conducted to investigate the most suitable liquids. The purpose of this study was to identify the optimal contrast enhancement liquid for dynamic MRI of swallowing. MRI was performed using a new sequence consisting of true fast imaging with steady-state precession, generalised auto-calibrating partially parallel acquisition and a keyhole imaging technique. Seven liquids were studied, including pure distilled water, distilled water with thickener at 10, 20 and 30 mg mL(-1) concentrations and oral MRI contrast medium at 1, 2 or 3 mg mL(-1) . Distilled water showed the highest signal intensity. There were statistically significant differences among the following contrast media: distilled water with thickener at 20 mg mL(-1) and the oral MRI contrast medium at 2 mg mL(-1) and 1 mg mL(-1) . It can be concluded that the optimal liquid for dynamic MRI of swallowing is a water-based substance that allows variations in viscosity.

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“…In spite of this, SNR changes were only statistically significantly different between 0 and 2 days in the TSE T1 sequence and no hyperintensity was observed subjectively in T1‐weighted images after refrigeration. In studies on human tissues, the change in T2 relaxation time with temperature decreases was more pronounced than the change in T1 relaxation time 18 and the slope of the regression line of the signal against temperature depended on the repetition time (TR) with a longer TR leading to a higher slope 19 . Signal changes in the TSE T2 sequences (long TR) may therefore have been more evident than changes in the TSE T1 sequence (short TR).…”

Section: Discussionmentioning

confidence: 99%

“…In studies on human tissues, the change in T2 relaxation time with temperature decreases was more pronounced than the change in T1 relaxation time 18 and the slope of the regression line of the signal against temperature depended on the repetition time (TR) with a longer TR leading to a higher slope. 19 Signal changes in the TSE T2 sequences (long TR) may therefore have been more evident than changes in the TSE T1 sequence (short TR).…”

Section: Discussionmentioning

confidence: 99%

Magnetic Resonance Signal Changes During Time in Equine Limbs Refrigerated at 4°c

Bolen

Haye

Dondelinger

et al. 2010

Vet Radiology Ultrasound

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When ex vivo magnetic resonance (MR) imaging studies are undertaken, specimen conservation should be taken into account when interpreting MR imaging results. The purpose of this study was to assess MR changes during time in the anatomic structures of the equine digit on eight cadaver limbs stored at 4 degrees C. The digits were imaged within 12 h after death and then after 1, 2, 7, and 14 days of refrigeration. After the last examination, four feet were warmed at room temperature for 24 h and reimaged. Sequences used were turbo spin echo (TSE) T1, TSE T2, short tau inversion recovery (STIR), and double-echo steady state (DESS). Images obtained were compared subjectively side by side for image quality and signal changes. Signal-to-noise ratio (SNR) was measured and compared between examinations. There were no subjective changes in image quality. A mild size reduction of the synovial recesses was detected subjectively. No signal change was seen subjectively except for bone marrow that appeared slightly hyperintense in STIR and slightly hypointense in TSE T2 sequence after refrigeration compared with day 0. Using quantitative analysis, significant SNR changes in bone marrow of refrigerated limbs compared with day 0 were detected in STIR and TSE T2 sequences. Warming at room temperature for 24 h produced a reverse effect on SNR compared with refrigeration with a significant increase in SNR in TSE T2 images. After 14 days of refrigeration a statistically significant decrease of SNR was found in bone marrow in TSE T2 and DESS sequences. The SNR in the deep digital flexor tendon was not characterized by significant change in SNR.

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Non-invasive temperature imaging of muscles with magnetic resonance imaging using spin-echo sequences

Cited by 13 publications

References 23 publications

The Influence of Temperature and Age on the T1 Relaxation Time of the Equine Distal Limb

The Influence of Temperature and Age on the T1 Relaxation Time of the Equine Distal Limb

Optimal contrast enhancement liquid for dynamic MRI of swallowing

Magnetic Resonance Signal Changes During Time in Equine Limbs Refrigerated at 4°c

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