Objective To explore application of GE Light speed 16 CT scanning technique in acute abdomen. Methods The technical parameters of GE Light speed 16 CT in acute abdomen were summarized systematically based on related studies. Results Logical scanning parameters can help to diagnose acute abdomen rapidly and accurately which should choose based on causes and positions about acute abdomen. Conclusion The technique of GE Light speed 16 CT scanning,based on individual characteristics of acute abdomen,is not only a rapid method for getting image material of acute abdomen and diagnosis,but also a reliable access to improve diagnostic accuracy.

Objective To study the CT findings in diagnosis of pulmonary mycosis and to improve its radiological diagnosis.Methods The CT findings of 32 cases of pulmonary mycosis were retrospectively analyzed,9 cases were confirmed by sur-gical pathology,13 cases were confirmed by sputum cultures,4 cases were confirmed by percutaneous needle lung biopsy,5 cases were confirmed by fibrobronchoscopy and brush biopsy,1 cases was confirmed by cerebrospinal fluid cultures.All of them were performed GE Light Speed 16 CT scan and reconstruction.Results Focus distribution: 10 cases in left lung,14 cases in right lung,11 cases in bilateral lung.Most of lesions are multiple,and they often can be found in inferior of bilateral lung.14 cases are solitary / multifocal mass or nodule(44%),9 cases are solitary or multiple patchy foci(28.4%),7 cases are patchy foci mixed with nodules(27.6%).Conclusion Pulmonary mycosis with characteristic mani-festation can be correctly diagnosed by CT scan.

BACKGROUND:Continuous monitoring is required in the survival, distribution, migration, proliferation and differentiation of transplanted stem cel s in vivo thereby to assess its efficacy and safety.
OBJECTIVE:To analyze the characteristics of literature addressing stem cel markers and MRI tracer in the past 10 years.
METHODS:The first author retrieved CNKI and Web of Science by computer for articles about MRI tracing of stem cel s published from January 2005 to December 2014, using the keywords of“stem cel s, magnetic resonance imaging, tracing technique”that appeared in the title and abstract. Then, the retrieved articles were further analyzed.
RESULTS AND CONCLUSION:Currently, tracing technique has been widely used in stem cel therapy, organ transplantation, bacterial infection, gene expression and new drug development. Stem cel tracing technologies include isotope tracing, antigenic labeling, fluorescence protein labeling, fluorescent dye labeling, nuclear magnetic resonance contrast enhancer labeling, Lac-Z gene labeling, Y chromosome labeling. Recently, with the development of molecular imaging, MRI tracing techniques have been increasingly used to assess the efficacy and safety of stem cel transplantation.

Objective To analyze CT features of adrenal non-functional pheochromocytoma and non-functional adenoma and to provide reference for the diagnosis and differential diagnosis.Methods 17 cases of adrenal non-functional pheochromocytoma and 31 cases of non-functional adenoma confirmed by pathology were analyzed retrospectively.The imaging findings of two groups of cases were statistically analyzed, including size, shape, density, enhanced degree, visible tumor blood vessels, necrosis and cystoid variation and so on.Results The average diameter of the pheochromocytoma was (52.2±20.2) mm, and the average diameter of the adenoma was (27.8±17.6) mm, the difference was statistically significant (P<0.05).The average CT value of pheochromocytoma was higher than that of adenoma in plain, arterial and venous phases(all P<0.05).Of the 17 cases of pheochromocytoma, 14 cases (82.4%) can be seen tumor blood vessels in the arterial phase, 12 cases (70.6%) can be seen necrosis and cystoid variation, the margins of the tumors were no circular or arc-like enhancement;of the 31 cases of adenoma, 3 cases (9.7%) can be seen tumor blood vessels in the arterial phase, 2 cases (6.5%) can be seen necrosis and cystoid variation,10 cases (32.3%) can be seen circular or arc-like enhancement;all the differences were statistically significant (all P<0.05).Conclusion Adrenal non-functional pheochromocytoma and non-functional adenoma have characteristic imaging findings, dual phase enhanced scanning of MSCT is helpful for clinical diagnosis and treatment, one of the distinguishing points is to find tumor blood vessels in arterial phase.

Objective To discuss the application value of the mobile DR in large-scale physical examination. Methods Compared each 500 chest images that collected for the physical examination by the mobile DR, direct digital radiography(DR), then did another comparison about each 300 chest images of mobile DR and phnendoskiascope, recorded them by no displayed, displayed and limpid-displayed. Results The resolution of images collected by the mobile DR was comparative with the ones collected by direct digital radiography, better than phnendoskiascope in showing details. Conclusion The mobile DR images have a good resolution ratio as DR images have, meanwhile, this machine is easy to be taken and removed Examination while DR could not, and therefore the machine can do large-scale physical whatever inside or outside.

Objective To analyze the application value of MSCT enhanced scanning in diagnosis of gastrointestinal mucoca associated lymphoid tissue(MALT) lymphoma.Methods 11 cases of gastrointestinal MALT lymphomas confirmed by pathology were analyzed retrospectively.The clinical data and imaging features of 11 cases were analyzed,including lesion sites, morphologic features and enhancement patterns of tumors,positions of lymph nodes,involvement of extranodal site excluding gastrointestinal tract.Results For morphologic features,8 cases (72.7%) were gastrointestinal wall thickening type, among them, 5 cases occurred in the stomach and 3 cases in the intestine;3 cases (27.3%) were localized mass/nodule type, among them, 2 cases occurred in the stomach and 1 case occurred in the intestine.The sign of aneurysmal dilatation was showed in 2 cases, which occurred in the intestinal tract.There was 1 case of localized mass/nodule MALT lymphoma in the ileocecal junction with local intestinal lumen stenosis.For the manifestations of enhanced scanning,10 cases (90.9%) of tumors were moderately or obviously enhanced, 9 cases (81.8%) showed homogeneous enhancement.For the involvement of lymph nodes and other extranodal organs, regional lymph nodes were involved in 5 cases(45.5%), regional lymph nodes and distant lymph nodes were involved in 1 case(9.1%), lymph nodes of both sides of the diaphragm were involved in 1 case (9.1%), extranodal sites excluding gastrointestinal tract were involved in 2 cases (18.2%).9 cases (81.8%) were classified as stage Ⅰ-Ⅱ, 2 cases (18.2%) were classified as stage Ⅳ.Conclusion MSCT enhanced scanning can provide a reliable basis for the diagnosis and staging of gastrointestinal MALT lymphoma.The chest and abdominopelvic cavity enhanced scanning is recommended as a routine examination.

PurposeAdult intussusception is rare, and clinical symptoms are atypical and tend to be misdiagnosed. This study aims to explore the imaging features of intussusception on multi-slice CT (MSCT) and to improve the diagnosis of this disease. Materials and Methods Sixty cases with intussusception conifrmed by pathology were recruited and imaging ifndings including sleeve head lesions, set sheath canal, exhumation of intestine, involved mesenteric fat, and blood vessels were retrospectively analyzed. Results The direct sings included 60 cases with target signs, 44 of them with single target signs and 16 of them with double target signs; the shape was kidney like in 39 cases and irregular in 21 cases; 22 cases showed double intestinal signs, 15 cases showed comet tail signs, and 25 cases showed mountain like with different direction. The indirect signs included 60 cases with thickened intestinal wall and 45 cases with mesenterium fat and vessel in enteric cavity, 12 cases with adjacent mesenteric mass and enlarged retroperitoneal lymph nodes, 15 cases with ascites, 7 cases with metastatic tumors, including 4 cases of liver metastasis, 2 of pelvic ossiifcation metastasis, and 1 of multiple organ metastasis, 1 case combined with renal calculus and 3 case with ureteral caluli. Conclusion There are some special CT manifestations of adult intussusception. Mountain like sign with different direction at the tail is one of the characteristics. CT plays an important role in clinical procedure.