Phase-offset multiplanar (POMP) volume imaging: a new technique.

Phase-offset multiplanar (POMP) imaging is a technique that excites several sections simultaneously for improved imaging efficiency. The centers of the reconstructed images from each of the POMP sections are offset from each other in the phase-encoding direction by means of view-dependent phase modulation of the radio-frequency (RF) excitation pulses and are placed adjacent to each other in the reconstruction. With a suitable reconstruction matrix size, the images can be made nonoverlapping and stored separately. At constant imaging time, signal-to-noise ratio (S/N), and resolution, POMP imaging produces a factor NP more sections than a conventional sequence but with a reduced field of view. Alternatively, imaging time may be increased by the factor NP to retain the same field of view but with the expected S/N advantage. The average RF power deposited by the 90 degrees composite RF pulse is greater by the factor Np, but the power for the 180 degrees pulse is unchanged. The POMP method is discussed and compared with three-dimensional and Hadamard techniques.     

在视频制作中静止图片的应用

视频中经常要用到一些“静止图片”，而且在使用中常常会出现一些意想不到的问题。文章结合制作实践，探讨了静止图片在视频制作中的应用技巧。     

Processed forms of neuroendocrine proteins 7B2 and secretogranin II are found in porcine pituitary extracts

The complete structure of the novel polypeptide 7B2 recently deduced from cDNA clones has been reported to be highly conserved in a variety of species. The deduced amino acid sequence of the mature protein is predicted to be 185 or 186 amino acids long. While its biological role is still unknown, its occurrence in neuroendocrine secretory granules has been largely documented. This report shows: (i) that the protein, isolated from a large quantity of porcine pituitary glands, does not correspond to the full predicted cDNA structure but, on the contrary, to a truncated form; (ii) that the latter could arise from proteolytic cleavage at position ISO following pairs of basic residues; (iii) that it contains an extra residue at position 100 which is absent in the cDNA sequence; and, finally, (iv) that it displays a higher than expected molecular weight on SDS-polyacrylamide gel electrophoresis. In addition, a copurifying peptide was identified as an NH₂-terminal related fragment of the secretogranin II molecule. Protein sequencing of the latter demonstrates (i) that the correct amino terminus of mature porcine secretogranin II is an Ala residue and not the previously proposed Gin residue and (ii) that this fragment could also arise from proteolytic cleavage at a pair of basic residues located within the secretogranin II sequence.     

计算机图像处理对提高乳腺X线诊断率及乳腺癌早诊的研究

探讨计算机图像处理对提高乳腺相靶Ｘ线诊断率及对乳腺癌早诊的价值。方法应用计算机焦采有色图像处理技术，对５０例正常乳腺和１６０例乳良，恶性病变典型Ｘ线图像进行处理。结果正常甩腺和典型良，恶性病变有其独特的图像特征。     

Relationships between information processing, depression, fatigue and cognition in multiple sclerosis.

The neurobehavioral sequelae of multiple sclerosis (MS) consistently include fatigue, depression and cognitive dysfunction with slower processing figuring prominently. However, processing speed is often confounded with accuracy and the relative contributions of depressed mood and fatigue in influencing speed of processing are difficult to quantify. Therefore, there were three objectives in this study. First, compare processing speed in MS and healthy controls under conditions in which accuracy is not confounded with speed; second, determine the relationships between information processing speed and cognition; third, determine the contributions of clinical depression and fatigue in mediating these relationships. Forty-eight participants with confirmed MS participated. The findings suggested that slower processing was correlated with higher levels of depressed mood, fatigue, lower verbal fluency, fewer words and digits recalled and poorer recall of visual-spatial information. Depression and physical fatigue had the greatest influence on the association between processing speed and more effortful tasks (e.g., immediate word recall and word list learning). Current findings extend previous work by using a more sensitive measure of processing speed and by quantifying the relative contributions of depression and fatigue in mediating relationships between processing speed and cognition.     

胎儿脐静脉管壁细胞核密度的形态定量研究

目的 :探讨胎儿脐静脉随胎龄变化的形态学。方法 :选取 33例 32～ 42周的新鲜脐带 ,横断取材 ,常规石蜡包埋、切片、染色、光镜观察、计算机图像定量分析。结果 :随胎龄的增长 ,脐静脉管径与中膜厚度逐渐增大 ,中膜平滑肌含量逐渐增多 ,但 40周以后呈下降态势。中膜平滑肌细胞核的数密度和面密度在 37～ 40周最大。结论 :脐静脉管壁中膜平滑肌含量与细胞核的数密度和面密度随胎龄增加而增多 ,建议选用胎龄在 37～ 40周之间的脐静脉作为移植材料。     

Psychological adjustment of critically injured patients three months after an unexpected,potentially life‐threatening accident

? Cognitive processing and meaning theories suggest that a patient’s psychological adjustment following a traumatizing event depends on an ability to cognitively integrate the trauma event and restore a sense of meaning in life. These processes may be facilitated by using coping strategies such as sharing concerns, mobilizing support, and reframing. ? A correlational study explored the magnitude of the relationships between psychological adjustment, cognitive processing, sense of meaning, and coping strategies in critically injured patients 3 months after a potentially life‐threatening injury. ? Fifty‐one critically injured patients completed the Brief Symptom Inventory, Bradburn’s Psychological Well‐Being Scale, Impact of Events Scale, the Meaning‐of‐Illness Questionnaire, and Family Crisis‐Oriented Personal Evaluation Scale in face‐to‐face interviews 8–12 weeks after the accident. Bivariate and partial correlation coefficients were used to test the main hypothesis, and Pearson correlation coefficients, to address the three research questions. ? The main hypothesis that psychological adjustment will be significantly related to cognitive processing, sense of meaning, and use of coping strategies in critically injured patients 3 months after the accident was partially upheld. ? Depressive symptomatology was found to be significantly associated with increased cognitive processing efforts and a decreased ability to acknowledge the accident’s negative effects on the self. ? In contrast, psychological well‐being was found to be significantly associated with decreased cognitive processing efforts and an increased ability to acknowledge the accident’s negative effects on the self. ? Restoring a sense of meaning, however, was found to be unrelated to sharing concerns, mobilizing support and re‐framing. The potential theoretical and clinical implications of the findings for nursing practice are discussed.     

自身输血装置

讨论了自身输血装置操作原理,基本结构、应用、存在问题和发展。同时也讨论了购置时应考虑因素。