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Volume calculation often begins with simple geometric solids. For example, the volume of a rectangular box is obtained by multiplying the area of its base by its height. This straightforward approach relies on the fact that the cross-sectional area of the box remains constant throughout its length. Many real-world objects, however, do not have uniform cross-sections, and their volumes cannot be determined using elementary geometric formulas.To address this limitation, the Slicing Method...

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Related Experiment Video

Updated: Jan 15, 2026

Author Spotlight: Point-of-Care Ultrasound for Gastric Content Assessment and Risk Stratification in Perioperative Care

Author Spotlight: Point-of-Care Ultrasound for Gastric Content Assessment and Risk Stratification in Perioperative Care

Published on: September 22, 2023

Gastric volumetry: A simplified calculation method based on CT-scan.

Charlene Fohrer¹, Aurelien Lambert², Marion Demouron³

¹CHU Amiens-Picardie, Service de Chirurgie Digestive et Oncologique Site Sud, 1, rond-point du Professeur Christian-Cabrol, 80054 Amiens cedex, France; Université de Picardie Jules-Verne, Unité de recherche Clinique SSPC (Simplifications des Soins des Patients Complexes) UR UPJV 7518, Amiens, France.

Journal of Visceral Surgery

|October 15, 2025

Summary

A quick CT scan method accurately measures gastric volume in adhesive small bowel obstruction patients. This aids decisions on nasogastric tube placement, reducing invasive procedures.

Keywords:

Adhesive small bowel obstruction Gastric volume Nasogastric tube Non operative management

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Area of Science:

Radiology
Gastroenterology
Surgical Critical Care

Background:

Computed tomography (CT) enables gastric volume calculation.
Initial gastric volume in adhesive small bowel obstruction (ASBO) can inform nasogastric tube (NGT) placement.
A rapid CT method for gastric volume assessment is needed.

Purpose of the Study:

To evaluate a fast CT technique for gastric volume measurement in ASBO patients.
To compare this quick method with traditional manual gastric contouring.
To assess the utility of CT-derived gastric volume in guiding NGT decisions.

Main Methods:

Gastric volumes were measured in 139 ASBO patients using contrast-enhanced CT scans.
Two methods were employed: manual gastric contouring and a novel two-diameter antral measurement.
Measurements were performed by two independent operators to assess correlation and reproducibility.

Main Results:

The two-diameter method showed strong correlation (r=0.88) with manual contouring.
The quick CT method significantly reduced measurement time (45 seconds vs. 365 seconds).
Intra-observer correlation was good (0.78), indicating reliability.

Conclusions:

A rapid CT measurement of gastric volume is feasible and accurate for ASBO patients.
This technique can assist in judicious nasogastric tube use.
It may help avoid unnecessary invasive procedures in ASBO management.