Abstract
Imaging methods for gastrointestinal diseases were based on X-ray imaging until the 1970s, but the development of fiberoptic endoscopy in the 1980s has replaced X-ray imaging. Endoscopy can directly observe the location, size, scope, and color of lesions and obtain pathological results through biopsy, while ligation and other treatments can be performed on polyps and other lesions. Studies have shown that multilayer spiral computed tomography (CT) examination after standardized gastrointestinal preparation and full use of the advantages of various 3D postprocessing reconstruction techniques are of great clinical value in the detection of gastrointestinal diseases, determination of the nature of lesions, localization of lesions, and staging of gastrointestinal malignancies and can make up for the shortcomings of fiberoptic endoscopy, and various 3D postprocessing reconstruction modes have their own advantages and disadvantages. Among them, conventional CT cross-sectional images are the basic images for the diagnosis of various gastric testicular lesions. Axial images, especially thin-layer axial images, can detect the absolute majority of lesions, but there are limitations in observing the anatomical position of lesions, invasion of surrounding tissues, lymph node metastasis, vascularity, and determination of the stage of malignant tumors.
Highlights
Gastrointestinal bleeding is a common clinical condition, most of which can be identified by gastroscopy and colonoscopy [1]. e American Gastroenterological Association defines obscure gastrointestinal bleeding (OGIB) as persistent or recurrent gastrointestinal bleeding, in which no lesion can be detected by conventional gastroscopy or fiberoptic colonoscopy [2]
MSCTA images showed a total of 9∼13 jejuno- and ileoenteric arteries emanating from the superior mesenteric artery. e results showed that the jejunal artery showed 3 to 8 branches, of which 3 to 5 branches accounted for 81.67% (49/60); the ileal artery showed 3 to 7 branches, of which 3 to 4 branches accounted for 85.0% (51/60); and the ileocolic artery and mesocolic artery showed 1 branch each. e mean number of branches emanating from the superior mesenteric artery was 10.20 ± 2.12 for the jejunum and ileum arteries together, including 4.13 ± 1.92 for the jejunum artery and 3.75 ± 1.34 for the ileum artery
High-frequency probes can more accurately differentiate between mucosal and submucosal carcinomas compared to conventional endoscopic ultrasonography (EUS). e use of ultrasound endoscopy for preoperative assessment of lesion infiltration depth and the probability of lymph node metastasis in early esophageal cancer has been widely accepted, but some studies have concluded that ultrasound gastroscopy is less accurate in staging esophageal cancer. e results showed that the sensitivity and specificity of ultrasound gastroscopy in determining the depth of tumor infiltration were 80%–90% and more than 90%, respectively, which endorsed the role of ultrasound gastroscopy in esophageal cancer staging
Summary
Gastrointestinal bleeding is a common clinical condition, most of which can be identified by gastroscopy and colonoscopy [1]. e American Gastroenterological Association defines obscure gastrointestinal bleeding (OGIB) as persistent or recurrent gastrointestinal bleeding, in which no lesion can be detected by conventional gastroscopy or fiberoptic colonoscopy [2]. CTVE is a computer software function that processes the images obtained from spiral CT volume scanning to simulate a threedimensional image of the inner surface of the cavity, which can simulate the view of an endoscope to observe the interior of the cavity It has the advantages of short time, noninvasive, and good tolerance, and it can use the data for multiple, multiplanar reconstruction to reduce the leakage caused by human factors [17]. E results showed that multilayer spiral CT examination after standardized gastrointestinal preparation and full use of the advantages of various 3D postprocessing reconstruction techniques are of great clinical value in the detection of gastrointestinal diseases, determination of the nature of lesions, localization of lesions, and staging of gastrointestinal malignancies and can make up for the shortcomings of fiberoptic endoscopy, and various 3D postprocessing reconstruction modes have their own advantages and disadvantages. Are limitations in observing the anatomical location of lesions, invasion of surrounding tissues, lymph node metastasis, vascularity, and determining the stage of malignant tumors
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