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Impedence를 이용하여 cross sectional area (CSA)를 측정할 수 있습니다. Impedance planimetry라고 합니다. 여러 sensor를 사용하여 반복하여 측정한 후 3차원으로 display하면 lower esophgeal sphincter의 모양을 입체적으로 관찰할 수 있습니다. 이를 상품화 한 것이 EndoFlip입니다. FLIP은 functional luminal imaging probe의 약자입니다.

Sketch of a conventional impedance planimetry probe with a single set of excitation (E) and sensing (S) electrodes for the measurement of cross-sectional area in the middle of the bag. D is the distance between the sensing electrodes. (McMahon. WJG 2016)

Diagram showing multi-electrode probe by Andersen et al for measuring 5 CSAs. (McMahon. WJG 2016)

Three dimensional reconstruction of the OGJ geometry in a human volunteer after distension in to a volume of 40 mL. All dimensions are in millimeters. Colour change is indicating increased radius. (McMahon. WJG 2016)


1) Functional oesophago-gastric junction imaging McMahon. World J Gastroenterol 2016

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