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Study on Invasion of Gastric Wall in Advanced Gastric Cancer by Triphasic Spiral CT

Author: ZhangJie
Tutor: ChenZuoHua
School: Jinan University
Course: Medical Imaging
Keywords: Stomach cancer Advanced CT Spiral Three scan Of invasion
CLC: R730.44
Type: Master's thesis
Year: 2000
Downloads: 90
Quote: 0
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Abstract


Objective: To investigate the performance of advanced gastric cancer spiral CT three scan images and their depth assessment of the value of gastric cancer gastric wall infiltration. Materials and Methods: 31 patients with histologically confirmed advanced gastric cancer have made a gastrointestinal imaging and spiral CT scan. CT scan intramuscular 654-2, warm water filling the stomach cavity. Intravenous bolus injection of contrast agent, respectively, after injection of 25 to 30 seconds (arterial phase), 70 to 80 seconds (non-equilibrium phase, equivalent to the portal venous phase) and 180 to 240 seconds (equilibrium phase) helical CT scans, and more planar reconstruction. Results: Helical CT of advanced gastric cancer detection rate of 100%. The thickness of the lesion was 19.79 ± 10.50mm, a length of 79.98 ± 29.48mm. 82.14% (23/28) lesions and gastric wall boundaries completely, 17.86% (5/28) of the lesion and the surrounding stomach wall was a transitional state. The normal gastric performance thin line, smooth and uniform. The lesion enhancement situation is different at different time. Arterial phase: 35.48% performance of the tumor was significantly enhanced linear surface portion protruding into the gastric lumen, and the rest no significantly enhanced lesion is divided into outer and inner layers; 51.62% tumors were irregular bolus enhancement; 12.90 % showed homogeneous enhancement of the lesion mild. 67.74% (21/31) of cases in the arterial phase shows most clearly. Non-equilibrium phase: 64.52% performance decline in the degree of enhancement of the tumor in the stomach cavity surface portion marked enhancement in the arterial phase, the rest of the tumor began to strengthen, the entire lesion showed heterogeneous enhancement; 19.35% lesion layered, the inner strengthening the most obvious , in the middle with a less continuous low-density outer lumps strengthen; homogeneous enhancement of 16.13% of the lesions. 12.90% (4/31) of cases in the non-equilibrium period most clearly. Equilibration period: 87.10% lesion homogeneous enhancement, but reduce the degree of enhancement than the non-equilibrium phase; 12.90% decline in the degree of lesion enhancement, but still layered. 6.45% (2/31) of cases in the balance of most clearly. 12.90% (4/31) cases in the above-mentioned three are very clear. Control and pathological specimens, of this Law T staging accuracy was 78.94% (15/19), T2 and T3 stage identification accuracy of 81.25% (13/16). Axial scanning multi-planar reconstruction, there are three cases to avoid the staging error. Conclusion: advanced gastric cancer spiral CT scan three arterial phase clinical value for the discovery of the lesions and tumors horizontal spread of the range of estimates; balance of findings to assess gastric infiltration depth accuracy, enhanced understanding of its CT type valuable; it is sought to liver metastases, non-equilibrium phase is essential. The stomach wall plane two-dimensional reconstructed image will certainly help deepen the relationship of the observed lesions and the surrounding tissue.

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CLC: > Medicine, health > Oncology > General issues > Tumor diagnostics > Radiation,isotope diagnostic
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