Precision and Accuracy of Measurements on CT Scout View

ObjectivesThe purposes of this study were to (1) investigate the limits of measurements on scout view in three computed tomography axes, x, y and z and (2) develop a model to provide better understanding of measurement accuracy.MethodsFor the first objective, anteroposterior and lateral scout views of a Catphan phantom 200 mm in diameter and length were acquired with a GE scanner at 21 different table heights. Phantom measurements on scout view were performed by two experienced readers. The comparison of their measures provided estimation of precision. The accuracy was assessed by determining the bias, calculated as the difference between the values measured on scout view and the real phantom size. Second, a model was developed investigating the relationship between the dimensions of the object, its image, and the table height. This relationship was tested on our data.ResultsScout view measurements were precise, with less than 0.53% difference between readers. In addition, small biases of about 1 mm were detected in the z-axis, whatever the table height. In the other axes, serious biases from −13 to +73 mm were measured. Furthermore, at isocentre, overestimations up to 7 mm were shown. The results also indicated that biases in scout view measurements are because of the geometrical projection related to the object-detector distance.ConclusionsMeasurements in the table movement axis are precise and accurate, conferring to scout views an added value for preoperative planning in orthopedic surgery.     

Utility of the 3‐Vessel and 3‐Vessel and Trachea Views in Prenatal Diagnosis of a Pulmonary Artery Sling

A pulmonary artery (PA) sling is a very rare congenital cardiovascular anomaly, and only a few studies have reported PA slings in fetuses. The relationship of the PA, aorta, ductus arteriosus, and trachea can be evaluated in the 3‐vessel and 3‐vessel and trachea views during fetal echocardiography. A PA sling can be detected by abnormal positioning of the left PA in relation to the trachea when sweeping from the 3‐vessel view cranially to the 3‐vessel and trachea view. Here we report 3 cases of fetal PA slings and their follow‐ups. Two cases were confirmed by postnatal echocardiography, and the other case was confirmed by a cardiovascular cast after pregnancy termination. We emphasize that the 3‐vessel and 3‐vessel and trachea views are of crucial importance in the prenatal diagnosis of a PA sling.     

Posterior dislocation of the sternoclavicular joint: report of two cases,with emphasis on radiologic management and early diagnosis

Posterior dislocations of the sternoclavicular joint are uncommon, but are potentially quite serious. Radiologic diagnosis and management are frequently difficult. The specialized projections available are not widely known, and the role of plain films is poorly understood. The incidence, pathomechanics, and clinical manifestations of such dislocations are presented and the radiologic diagnosis is discussed.     

Auditory Perception and the Control of Spatially Coordinated Action of Deaf and Hearing Children

From birth onwards, auditory stimulation directs and intensifies visual orientation behaviour. In deaf children, by definition, auditory perception cannot take place and cannot, therefore, make a contribution to visual orientation to objects approaching from outside the initial field of view. In experiment 1, a difference in catching ability is demonstrated between deaf and hearing children (10-13 years of age) when the ball approached from the periphery or from outside the field of view. No differences in catching ability between the two groups occurred when the ball approached from within the field of view. A second experiment was conducted in order to determine if differences in catching ability between deaf and hearing children could be attributed to execution of slow orientating movements and/or slow reaction time as a result of the auditory loss. The deaf children showed slower reaction times. No differences were found in movement times between deaf and hearing children. Overall, the findings suggest that a lack of auditory stimulation during development can lead to deficiencies in the coordination of actions such as catching which are both spatially and temporally constrained.     

View ordering for magnetization prepared steady state free precession acquisition: application in contrast-enhanced MR angiography.

Magnetization prepared segmented acquisition requires a view order that maximizes signal contrast during the acquisition of the central portion of k-space. Steady state free precession (SSFP) acquisition further requires a view order that minimizes changes in phase-encoding gradients from one repetition to the next in order to minimize eddy current artifacts. In this article, optimal view ordering schemes satisfying these two requirements are formulated and applied to inversion prepared 3D SSFP contrast-enhanced MR angiography (MRA). Experiments on phantoms and pigs demonstrated improved background suppression and reduced image artifacts.     

Development of phantom for radiographic image optimization of standard patient in the lateral view of chest and skull examination

We present the construction of a homogeneous phantom to be used in simulating the scattering and absorption of X-rays by a standard patient chest and skull when irradiated laterally. This phantom consisted of lucite and aluminium plates with their thickness determined by a tomographic exploratory method applied to the anthropomorphic phantom. Using this phantom, an optimized radiographic technique was established for chest and skull of standard sized patient in lateral view. Images generated with this optimized technique demonstrated improved image quality and reduced radiation doses.     

住院病人抗生素的合理使用回顾与前瞻

本文报告我院抗生素的用药情况,发现抗生素使用面广,应用中存在问题较多,因此,我们采用“药历表”调查病历中抗生素的使用情况,并在提倡“围术期”预防用抗生素等方面做了一些工作。随机抽查1988年7月～1990年4月已出院病历710份,对使用过抗生素的病历进行了回顾性调查,发现抗生素使用率达到85％左右。前瞻性检查方式:参加对严重感染或混合感染病人的会诊用药,并追踪观察抗生素的使用效果;实地检查抗生素所用溶媒、给药间隔、给药方法、配伍变化及联合用药,并对其安全性、合理性进行了讲评,逐步改变目前带普遍性不合理使用的现象和预防性使用抗生素是否合理的问题。     

急性鼻窦炎模型大鼠服用鼻渊舒口服液后血清中锌离子浓度的变化研究

目的 :探讨鼻渊舒口服液对大鼠实验性急性化脓性鼻窦炎的治疗情况及其作用机理 ,为临床推广应用中医药治疗鼻窦炎提供实验依据。方法 :采用向大鼠上颌窦腔内注射金黄色葡萄球菌混悬液法 ,建立实验性急性化脓性鼻窦炎模型。结果 :实验性急性化脓性鼻窦炎大鼠一般情况较差 ,鼻渊舒口服液低、中剂量治疗后症状明显改善。其中鼻渊舒中剂量提高了模型大鼠血清锌离子浓度。鼻渊舒口服液高剂量组无明显改善。结论 :推测适宜浓度范围的鼻渊舒口服液通过调整体内微量元素锌离子浓度 ,从而来调节机体新陈代谢 ,增强机体免疫功能等作用达到有效地治疗鼻窦炎的目的。     

论医务人员树立社会主义荣辱观的意义

当前，在医务人员中树立社会主义荣辱观，可以使其确立正确的世界观、人生观和价值观，从而明白在社会主义社会的医院里，什么是真善美，什么是假恶丑，应当坚持什么、反对什么，提倡什么，抵制什么，这既是重塑医务人员良好形象的需要，又是纠正医疗行业不正之风的需要，还是构建和谐医患关系的需要。