ABSTRACT
Objective To assess the effectiveness of Z-axis automatic tube current modulation ( ATCM) technique with respect to dose reduction and image noise in the thyroid regional tissues during neck computed tomography angiography (CTA). Methods A total of 140 patients underwent neck CTA with 64-slice spiral CT, and were randomized into fixed-tube current group and ATCM group. Objective noise, CTDIw, DLP and mA of each group were recorded. Results The image qualities of all the patients were diagnostically acceptable, though the objective noise of neck in the ATCM group was higher than that in the group of fixed-tube current (P＜ 0.05 ). The radiation doses in the ATCM group [ CTDIw (35.99±1.31 ) mGy, DLP (11 121.39 ±5.51) mGy·cm] were significantly inferior to those in the group of fixed tube current [ CTDIw (43.22±1.42) mGy, DLP (1514.45±5.56) mGy·cm]. Conclusions Compared with fixedtube current technique, ATCM technique could significantly reduce the radiation dose in neck CT with diagnostic acceptability of the image quality.
ABSTRACT
Objective To study the relation between th e administration of surgical operation for the stomach proximal tumor and the sa rvival time.Methods The operation pathes and ways were cho se according to the tumor＇s size, distance to the cardia and the general sitacet ion of the patients. The patients effected a radical cure were 84, among which , total stomach excision 31 cases , upper half stomach excision 42 cases , lower half stomach excision 11 cases; by abdomen incision 72 cases , by chest abdomen combination incision 8 cases, by chest incision 4 cases. These patients receiv ed routine FM chemotherapise after operation and were compared with 14 patients received only chemotherapies or failed to excision.Results 84 patients with stomach tumor effected a radical cure didn＇t occure death rel ation to operation . After 1,3,5 years following visit , the survival ratio o f 84 patients received surgical operation was 84,44 and 26 cases respectively, the 5 years survival ratio was 30.9%. 14 patients who did not recieve surgical o peration or failed to excision died within 3-11 months exclusively.Con clusions The stomach proximal tumor excision could prolong the pati ents survival time. The early tumor excision is more effective.