Black CJ, Ford AC. Global burden of irritable bowel syndrome: trends, predictions and risk factors. Nat Rev Gastroenterol Hepatol. 2020;17(8):473–86.

Article  Google Scholar 

Oka P, et al. Global prevalence of irritable bowel syndrome according to Rome III or IV criteria: a systematic review and meta-analysis. Lancet Gastroenterol Hepatol. 2020;5(10):908–17.

Article  Google Scholar 

Beppu T, et al. Mucosal healing of ileal lesions is associated with long-term clinical remission after infliximab maintenance treatment in patients with Crohn’s disease. Digest Endosc. 2015;27(1):73–81.

Article  Google Scholar 

Ohgo H, et al. Irritable bowel syndrome evaluation using computed tomography colonography. World J Gastroenterol. 2016;22(42):9394.

Article  Google Scholar 

Åkerman A, et al. Computational postprocessing quantification of small bowel motility using magnetic resonance images in clinical practice: an initial experience. J Mag Resonance Imaging. 2016;44(2):277–87.

Article  MathSciNet  Google Scholar 

Hahnemann ML, et al. Quantitative assessment of small bowel motility in patients with Crohn’s disease using dynamic MRI. Neurogastroenterol Motil. 2015;27(6):841–8.

Article  Google Scholar 

Månsson S, Ekberg O, Ohlsson B. Motility index measured by magnetic resonance enterography is associated with sex and mural thickness. World J Gastroenterol. 2020;26(36):5484.

Article  Google Scholar 

Menys A, et al. Quantified terminal ileal motility during MR enterography as a biomarker of Crohn disease activity: prospective multi-institution study. Radiology. 2018;289(2):428–35. https://doi.org/10.1148/radiol.2018180100.

Article  Google Scholar 

Ogawa M, et al. Evaluation of perioperative intestinal motility using a newly developed real-time monitoring system during surgery. World J Surg. 2021;45:451–458s.

Article  Google Scholar 

Tuscharoenporn T, Uruwankul K, Charoenkwan K. Effects of postoperative gum chewing on recovery of gastrointestinal function following laparoscopic gynecologic surgery: systematic review and meta-analysis of randomized controlled trials. J Clin Med. 2024;13(10):2851.

Article  Google Scholar 

Takeshi T, et al. Gastrointestinal sounds and migrating motor complex in fasted humans. Off J Am Coll Gastroenterol. 1999;94(2):374–81.

Article  MathSciNet  Google Scholar 

Horiyama K, et al. Bowel sound-based features to investigate the effect of coffee and soda on gastrointestinal motility. Biomed Sig Process Control. 2021;66: 102425.

Article  Google Scholar 

Haraguchi T, et al. Peak-frequency histogram similarity of bowel sounds for the evaluation of intestinal conditions. Appl Sci. 2023;13(3):1405.

Article  Google Scholar 

Haraguchi T, Emoto T. Stimulus–response plots as a novel bowel-sound-based method for evaluating motor response to drinking in healthy people. Sensors. 2024;24(10):3054.

Article  Google Scholar 

Craine BL, Silpa ML, O’toole CJ. Two-dimensional positional mapping of gastrointestinal sounds in control and functional bowel syndrome patients. Digest Dis Sci. 2002;47:1290–6.

Article  Google Scholar 

Dimoulas CA. Audiovisual spatial-audio analysis by means of sound localization and imaging: a multimedia healthcare framework in abdominal sound mapping. IEEE Trans Multimed. 2016;18(10):1969–76.

Article  Google Scholar 

Garner CG, Ehrenreich H. Non-invasive topographic analysis of intestinal activity in man on the basis of acoustic phenomena. Res Exp Med. 1989;189:129–40.

Article  Google Scholar 

Ranta R, et al. Towards an acoustic map of abdominal activity. Proceedings 25th Ann. Int. Conf. IEEE Eng. Med. Biol. Soc. (IEEE Cat. No. 03CH37439). 2003;3.

Zubal IG, et al. Computerized three-dimensional segmented human anatomy. Med Phys. 1994;21(2):299–302.

Article  Google Scholar 

Sim KH, et al. The appropriateness of the length of insulin needles based on determination of skin and subcutaneous fat thickness in the abdomen and upper arm in patients with type 2 diabetes. Diabetes Metabol J. 2014;38(2):120–33.

Article  Google Scholar 

Helander HF, Fändriks L. Surface area of the digestive tract–revisited. Scandinavian J Gastroenterol. 2014;49(6):681–9.

Article  Google Scholar 

Emoto T, et al. Evaluation of human bowel motility using non-contact microphones. Biomed Phys Eng Exp. 2016;2(4): 045012.

Article  Google Scholar 

Hsu F, et al. Locating stridor caused by tumor compression by using a multichannel electronic stethoscope: a case report. J Clin Monitor Comput. 2021;35:663–70.

Article  Google Scholar 

Bushberg JT, Boone JM. The Essential Physics of Medical Imaging. Lippincott Williams & Wilkins; 2011.

Hertzberg BSH, Middleton WD. Ultrasound: the requisites. Elsevier Health Sciences; 2015.