scholarly journals Automatic Assessment of Human Gastric Motility and Emptying from Dynamic 3D Magnetic Resonance Imaging

2020 ◽  
Author(s):  
Kun-Han Lu ◽  
Zhongming Liu ◽  
Deborah Jaffey ◽  
John Wo ◽  
Kristine Mosier ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Image Processing ◽  
Gastric Emptying ◽  
Magnetic Resonance ◽  
Gastric Motility ◽  
Type I ◽  
Resonance Imaging ◽  
Automatic Assessment ◽  
Processing Pipeline ◽  
Healthy Humans

Background: Time-sequenced magnetic resonance imaging (MRI) of the stomach is an emerging technique for non-invasive assessment of gastric emptying and motility. However, an automated and systematic image processing pipeline for analyzing dynamic 3D (i.e., 4D) gastric MRI data is not yet available. This study introduces an MRI protocol for imaging the stomach with high spatiotemporal isotropic resolution and provides an integrated pipeline for assessing gastric emptying and motility simultaneously. Methods: Diet contrast-enhanced MRI images were acquired from seventeen healthy humans after they consumed a naturalistic contrast meal. An automated image processing pipeline was developed to correct for respiratory motion, to segment and compartmentalize the lumen-enhanced stomach, to quantify total gastric and compartmental emptying, and to compute and visualize gastric motility on the surface of the stomach. Key Results: The gastric segmentation reached an accuracy of 91.10±0.43% with the Type-I error and Type-II error being 0.11±0.01% and 0.22±0.01%, respectively. Gastric volume decreased 34.64±2.8% over 1 hour where the emptying followed a linear-exponential pattern. The gastric motility showed peristaltic patterns with a median = 4 wave-fronts (range 3 - 6) and a mean frequency of 3.09±0.07 cycles per minute (CPM). Further, the contractile amplitude was stronger in the antrum than in the corpus (antrum vs. corpus: 5.18±0.24 vs. 3.30±0.16 mm; p < .001). Conclusions & Inferences: The automated, streamlined software can process dynamic 3D MRI images and produce comprehensive and personalized profiles of gastric motility and emptying. This software will facilitate the application of MRI for monitoring gastric dynamics in research and clinical settings.

Measurement of gastric emptying and gastric motility by magnetic resonance imaging (MRI)

1994 ◽  
Vol 39 (S12) ◽  
pp. 101S-103S ◽  
Author(s):  
W. Schwizer ◽  
R. Fraser ◽  
J. Borovicka ◽  
G. Crelier ◽  
P. Boesiger ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Gastric Emptying ◽  
Magnetic Resonance ◽  
Gastric Motility ◽  
Resonance Imaging ◽  
Magnetic Resonance Imaging Mri

Gastric motility and emptying assessment by magnetic resonance imaging after lung transplantation: correlation with gastric emptying scintigraphy

2016 ◽  
Vol 42 (3) ◽  
pp. 818-824 ◽  
Author(s):  
Nobuyuki Hayakawa ◽  
Yuji Nakamoto ◽  
Toyofumi F. Chen-Yoshikawa ◽  
Aki Kido ◽  
Takayoshi Ishimori ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Gastric Emptying ◽  
Magnetic Resonance ◽  
Lung Transplantation ◽  
Gastric Motility ◽  
Resonance Imaging ◽  
Gastric Emptying Scintigraphy

Gastric accommodation and motility are influenced by the barostat device: assessment with magnetic resonance imaging

2007 ◽  
Vol 292 (1) ◽  
pp. G208-G214 ◽  
Author(s):  
Ingrid M. de Zwart ◽  
Jeoffrey J. L. Haans ◽  
Paul Verbeek ◽  
Paul H. C. Eilers ◽  
Albert de Roos ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Gastric Emptying ◽  
Magnetic Resonance ◽  
Gastric Motility ◽  
Three Dimensional ◽  
Resonance Imaging ◽  
Gastric Accommodation ◽  
Gastric Physiology ◽  
Magnetic Resonance Imaging Mri

The barostat is considered the gold standard for evaluation of proximal gastric motility especially for the accommodation response to a meal. The procedure is invasive because it involves the introduction of an intragastric catheter and bag and is not always well tolerated. Moreover, the barostat bag itself may influence motility. Nowadays magnetic resonance imaging (MRI) is able to measure several aspects of gastric motility noninvasively. To evaluate whether the accommodation response of the stomach, observed with the barostat, is present during MRI and whether the barostat interferes with gastric physiology, gastric accommodation, motility, and emptying were studied twice in 14 healthy subjects with MRI using three-dimensional volume scans and two-dimensional dynamic scans once in the presence of a barostat bag and once when the barostat bag was not present. Fasting and postprandial intragastric volumes were significantly higher in the experiment with barostat vs. without barostat (fasting: 350 ± 132 ml vs. 37 ± 21 ml, P < 0.0001; postprandial: 852 ± 126 ml vs. 361 ± 62 ml, P < 0.0001). No significant differences were found in gastric emptying (88 ± 41 vs. 97 ± 40 ml/h, not significant) and contraction frequency between both experiments. The accommodation response observed in the presence of the barostat bag was not observed in the absence of the barostat bag. In conclusion, the presence of an intragastric barostat bag does not interfere with gastric emptying or motility, but the accommodation response measured with the barostat in situ is not observed without the barostat bag in situ. Gastric accommodation is a nonphysiological barostat-induced phenomenon.

Measurement of proximal and distal gastric motility with magnetic resonance imaging

1996 ◽  
Vol 271 (1) ◽  
pp. G217-G222 ◽  
Author(s):  
W. Schwizer ◽  
R. Fraser ◽  
J. Borovicka ◽  
K. Asal ◽  
G. Crelier ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Gastric Emptying ◽  
Magnetic Resonance ◽  
Gastric Motility ◽  
Resonance Imaging ◽  
Proximal Stomach ◽  
Distal Stomach ◽  
Basal Diameter ◽  
Magnetic Resonance Imaging Mri ◽  
Gastric Contractions

The precise motor mechanisms associated with gastric emptying of nutrient liquids are unclear, in part because of difficulties in measuring the motility from the proximal and distal stomach simultaneously. We have now examined proximal and distal gastric motility, using a novel magnetic resonance imaging (MRI) technique. In seven healthy volunteers (4 males, 3 females; 27-37 yr), gastric emptying and motility were determined on two occasions after ingestion of 500 ml 10% and 25% dextrose labeled with 1 mM gadolinium tetraazacyclododecane tetraacetic acid, using a 1.5-tesla Philips Gyroscan ACS II scanner. Gastric emptying was determined every 15 min with a series of transaxial scans. After each series of transaxial scans, 120 coronal scans, 1.2 s apart, were performed through the antrum and proximal stomach. For each coronal slice the diameters of the proximal stomach and the antrum were measured to determine the number of contractions per minute and depth (%basal diameter). Gastric emptying (half-emptying time) was faster after ingestion of 10% compared with 25% dextrose (49 +/- 15 vs. 118 +/- 37 min; P < 0.01). After both meals, the diameter of the proximal stomach remained relatively constant, whereas there were marked fluctuations in the diameter of the antrum. Mean (+/- SD) frequency (2.8 +/- 0.6 vs. 2.0 +/- 0.8/min; P < 0.001) and depth (40 +/- 17% vs. 34 +/- 16%; P < 0.04) of antral contractions were higher after 10% dextrose compared with 25% dextrose. Rapid MRI techniques allow simultaneous measurement of both gastric emptying and motor function of different gastric regions. The increase in the frequency and depth of distal gastric contractions during ingestion of 10% compared with 25% dextrose supports the concept that the antrum contributes to the regulation of gastric emptying of nutrient liquids.

EVALUATION OF MYOMETRIAL INVASION AND CERVICAL INVOLVEMENT IN TYPE I ENDOMETRIAL CANCER USING DIFFUSION-WEIGHTED MAGNETIC RESONANCE IMAGING

2020 ◽  
pp. 4-6
Author(s):  
HARIYONO WINARTO ◽  
BRIAN PRIMA ARTHA ◽  
SAHAT B. MATONDANG ◽  
TANTRI HELLYANTI ◽  
ARIA KEKALIH
Keyword(s):  
Magnetic Resonance Imaging ◽  
Endometrial Cancer ◽  
Magnetic Resonance ◽  
Cancer Patients ◽  
Myometrial Invasion ◽  
Type I ◽  
Resonance Imaging ◽  
Diffusion Weighted ◽  
Weighted Magnetic Resonance Imaging ◽  
Cervical Involvement

Objective: Surgical procedure and adjuvant treatment of type I endometrial cancer were affected by some variables assessed preoperatively. Diffusion-weighted magnetic resonance imaging (DWI) is a promising modality in evaluating myometrial invasion and cervical involvement, investigating the diagnostic values of DWI in assessing myometrial invasion and cervical involvement. Methods: A cross-sectional study was conducted. This study involved all type I endometrial cancer patients in Dr. Cipto Mangunkusumo Hospital from April 2016 until April 2019. The depth of myometrial invasion and cervical involvement was examined using 1.5-T MR unit. The result was compared to the surgical pathologic findings as the reference standard. Results: 34 types I endometrial cancer patients were enrolled in this study. The sensitivity of DWI in evaluating myometrial invasion and cervical involvement in type I endometrial cancer was 94.12% and 57.14%, while the specificity was 64.71% and 92.59%, respectively. Conclusion: DWI can provide reliable prognostic variable information about the myometrial invasion and cervical involvement in the preoperative preparation of endometrial cancer patients.

Sign in / Sign up

Export Citation Format

Share Document