ABSTRACT
Objective: To investigate the values of Computed Tomography [CT] in diagnosing postoperative pancreatic surgery abdominal infection and its efficacy and to provide a reasonable method for the diagnosis of abdominal infection
Methods: Seventy-two patients who were confirmed as resectable pancreatic carcinoma by physical examination, CT, positron emission tomography [PET]/CT, endoscopic retrograde cholangiopancreatography [ER-CP], endoscopic ultrasonography and mesenteric angiography and were admitted to the Binzhou People's Hospital, Shandong, China, from July 2013 to July 2015 were randomly selected. The plain CT images and clinical data of the patients were retrospectively analyzed
Results: Among 72 patients, 32 patients were diagnosed as abdominal infection by CT, three patients were misdiagnosed [two cases of intestinal obstruction and one case of intraperitoneal abscess], and 2 patients were wrongly diagnosed as suppurative abdominal inflammation. As regards distribution of CT imaging positive performance, the number of patients with intestinal loop abscess accounted for 41.7%, subphrenic abscess for 16.7%, pelvic abscess for 33.3%, the existence of septation for 25%, and emphysema sign for 16.7%. As to the distribution of CT findings of intestinal obstruction, 46.1% of patients had dilatation of intestine, 30.8% for bowel wall thickening, 7.7% had abnormal enhancement, 11.1% had density abnormality, and 15.4% had mesenteric effusion. CT features of purulent peritonitis showed 57.1% of patients had peritoneal thickening, 42.9% had peritoneal effusion, 42.9% had free intraperitoneal air, 14.3% had intestinal walls edema, and 28.6% had mesenteric edema
Conclusion: The diagnosis of postoperative abdominal infection of patients with pancreatic carcinoma using CT is quick and efficient showing the pattern and distribution of collection and the gross reaction to the exciting infection
ABSTRACT
Objective: To measure setup error of head and neck neoplasm in radiotherapy and discuss over effects of error on physical dose acting on target region and organs at risk of nasopharynx cancer [NPC] patients treated with intensity modulated radiation therapy [IMRT]
Methods: A total of 152 patients who developed head and neck neoplasm and received IMRT were randomly selected. Through comparing digital portal image and digital reconstruction image, we measured setup error, calculated expanding margin from clinical target volume [CTV] to planning target volume [PTV] and analyzed whether there was rules between setup error and treatment time. Additionally, 20 cases of NPC were selected. Three-dimensional error was simulated in planning system. Dose distribution was recalculated and a series of dose parameters of target volume and OAR were analyzed
Results: Setup error in left-right, head-feet and ventral-dorsal direction was [-0.62 +/- 1.46] mm, [-0.41 +/- 1.54] mm and [-0.31 +/- 1.67] mm respectively. Regarding limit value, the maximum and minimum value in left right direction, head-feet direction and ventral-dorsal direction was 2.70 mm and -6.00 mm; 3.00 mm and -5.00 mm, 5.00 mm and -7.50 mm. Expanding margin from CTV to PTV was 2.26 mm, 1.88 mm and 1.97 mm in left-right direction, head-feet direction and ventral-dorsal direction
Conclusion: During IMRT, only when setup error is controlled below 3 mm can sharply reduce the damage caused by radiation to normal tissue; therefore, quality security and control of electronic portal imaging device need [EPID] to be improved