Objective To explore the benefit from eye-lens dose reduction and the impact on the clinical imaging quality using orbital bismuth shield in infant head CT.Methods According to the width and length of the patients' eyes,the eye-shield was modified for infant sizes.An infant head CTDI phantom was scanned twice with and without eye-lens bismuth shielding.The infant CT head protocols were 120 kV,130 mA with axial sequential scanning.The thermoluminescence detectors (TLD) were used to detect the organ dose of eye lens.Ninety-nine infant cases clinically suspected intracranial hemorrhage were scanned with the same CT scanning protocol.Two senior radiologists scored the image quality and evaluated the consistency of scores.Results The radiation dose for eye-lens was reduced by 32％ on phantom test.The rate of accepted imaging was 92％ and κappa value between two radiologists was 0.78.Conclusions The eye-shield could reduce doses to eve-lens significantly in infant head CT scanning with acceptable image quality.

Objective To improve children′s radiation dosage through adjusting CT head scanning parameter. Methods During December 2006 to June 2007,292 cases were selected at random to adjust CT head scanning parameter, mainly for charge of voltage, tube current and scan time. At the same time,all images were appraised by two doctors. Results Adjustment of children′ s head scanning parameter could reduce the radiation dosage obviously, and no influence for diagnosis. Conclusion It′s no affect for diagnosis to improve children′s head CT scanning parameter, and leads reduction of CT dosage obviously.

The transfixion pin is composed of a pin body, pin core and a dilator connected with the end of pin body. Before application, the dilator has to be localized where tracheal puncture is performed. The regulating bolt is turned in clockwise direction to enlarge puncture faucet, and then the steel wire is introduced into trachea by the intubation. With this transfixion pin, puncture and dilation can be performed at one time and there is no need for trachea incision.

病例资料患者,男,57岁,因右上腹隐痛半年,呕吐伴双下肢浮肿2周.体检:反应迟钝,全身皮肤轻度黄染,双下肢凹陷性水肿.无饮酒及肝炎史.胸片:心脏明显扩大(图1).彩色多普勒检查:肝动脉蛇行纡曲扩张,肝实质内见团片状血管瘤样偏强回声结节.

Objective To evaluate the usefulness of rotational digital subtraction angiography (RDSA) on segmental transarterial chemoembolization (S-TACE) for HCC.Methods Conventional DSA and RDSA were performed in sequence on 30 patients with HCC who were going to receive S-TACE.Angiographic differences between the two methods in demonstrating sub-segmental branches of hepatic artery,tumor feeding arteries and tumor stain were observed and analyzed with χ 2 test.Results General image quality was better and angiographic details of tumor were more clear in conventional DSA,whereas RDSA has a significant higher ability to show the differentiable branch of sub-segmental hepatic artery and tumor feeding artery ( P 0.001).Conclusion RDSA has the advantage in demonstrating the sub-segmental hepatic artery branch and tumor feeding artery.Combined application of RDSA with conventional DSA will help to improve TACE efficiency.