Magnifying endoscopy provides high-resolution images that enhance the detection of early gastrointestinal lesions. However, conventional manual zoom techniques require frequent focal adjustments, which can be technically demanding and may compromise image stability, especially in complex anatomical settings. This study evaluates a novel one-click autofocus system based on image recognition and computer vision algorithms. The system automatically adjusts focal distance within seconds, eliminating the need for manual operation. This trial aims to compare the efficiency and image quality of one-click autofocus versus segmented manual focus in patients undergoing magnifying endoscopy for gastric diseases. A tandem randomized controlled trial will be conducted to assess procedure time, image clarity score, and operator satisfaction between the two techniques.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
DIAGNOSTIC
Masking
SINGLE
Enrollment
93
Magnifying endoscopy examination performed using the one-click autofocus mode. The system automatically adjusts focus to the optimal plane with a single button press.
Magnifying endoscopy examination performed using the segmented focus mode. The endoscopist manually adjusts the focus level stepwise through multiple pre-set focal planes.
Qilu Hospital of Shandong University
Jinan, Shandong, China
Image Quality Quantification by Edge Detection Analysis
Image quality is objectively quantified using edge detection analysis applied to standardized images captured by each technique. The standard deviation of pixel intensity after edge detection processing is used as the quantitative metric. A higher standard deviation indicates higher image contrast and edge definition, reflecting superior image quality. All image analyses are performed offline by an independent researcher blinded to the technique used.
Time frame: Day 1 (During the endoscopic examination)
Subjective Image Quality Assessment by Blinded Expert Review
Image quality is subjectively assessed by two to three independent expert reviewers blinded to the technique used. Recorded videos of magnifying endoscopy examinations are reviewed offline and scored using a 5-point Likert scale, where 1 = poor and 5 = excellent. Higher scores indicate superior image quality. The final score for each image is the average of the reviewers' scores.
Time frame: Day 1 (During the endoscopic examination)
Image Acquisition Time per Capture
Time (in seconds) measured for each image acquisition, defined as the duration from the moment the endoscope makes contact with the target gastric mucosa to the capture of the final magnified image for each technique.
Time frame: Day 1 (During the endoscopic examination)
This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.