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您的检索式：作者名="M.Metwally"
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| 1 | 用于重质衰竭油藏的富化气压力循环法显示文摘由于加拿大重质油藏多为薄层或有底水存在,过量的热易散失进周围地层,所以大多数油藏在一次采油后不可能用热采法来开采。溶剂蒸汽采油法(VAPEX)和其它类似方法都面临着许多问题,主要是油藏衰竭,一次采油后留下的孔道或”杀虫状气孔”和新钻水平共、设备和溶剂的高成本。因此;需要一种新的方法来解决这些问题。本文概括介绍了富化气压力循环法,并讨论了控制它的各种机理。该方这具有许多吸引人之处,其目的就是应用一次采油后形成的条件。它可以利用现有井而无需钻新井,也不需要进行水处理或添加大型设备,而且具有注入速度相对较小,作业压力不高。注入剂漏失小,有效采收率高的特点。 | M.Metwally 王忠 李明军 | 1999 | 国外油田工程1999，15，7： | 0 |
| 2 | 轴流透平中煤灰粒径分布对粒子动态特性和叶片磨蚀的影响显示文摘本文提出了轴流式燃气透平中煤灰粒径分布对粒子动态特性和叶片磨蚀方面影响的研究结果。在透平叶片流道内应用三元流分析法求解粒子动态特性及其对叶片的冲击。用由实验测量导出的经验公式来描述粒子的回弹情况和叶片材料的磨蚀特性。对典型的煤灰粒径分布所做的研究结果表明,煤灰粒径分布对叶片磨蚀的程度和图样有着显著的影响。 | W.Tabakoff A.Hamed M.Metwally 钱正元 | 1993 | 燃气轮机技术1993，6，1： | 0 |
| 3 | Comparison of bone alignment and fiducial marker alignment for online cone-beam computed tomography-guided radiation therapy for prostate cancer显示文摘Objective The aim of the study was to evaluate the coverage of the prostate when prostatic implanted fiducial markers are used to verify setup of the patients in comparison to the pelvic bones while using conebeam computed tomography(CBCT). Methods Seventeen patients with prostate cancer were included. For each patient, daily online CBCT was done. CT planning was matched with CBCT with the help of fiducial markers(3–5 markers) and another matching with done the help of pelvic bony landmarks. Registration of clinical target volume(CTV) 1 including prostate plus seminal vesicles and CTV2 including prostate only was done and were used to confirm the target volume during the process of matching. Delineation of the rectum on every CBCT was done. Two automatic margin representing planning target volume(PTV) were created. PTV1 was generated by adding 1 cm in all directions(PTV1a) and 0.7 cm in the posterior direction(PTV1b). PTV2 was generated by adding 0.5 cm in all directions(PTV2a) and 0.3 cm in the posterior direction(PTV2b). PTV1a was prescribed to receive 46 Gy in conventional fractionation with a boost dose of 30 Gy to PTV1b. The same dose was prescribed to PTV2a and PTV2b. Calculation of the percentage of intersection between CTV1and CTV2 created on CBCT with the original CTV scan was done. A comparison between the two CTVs(CTV1and CTV2) mean dose and the original delineated CTV was done. Then a comparison to the mean dose of the original CTV of PTV1a, PTV2a(CTV1a and CTV2a), and for PTV1b and PTV2b(CTV1b and CTV2b). Calculation of the mean rectal dose and also V60, V70 and V74 was done on the delineated rectum on every CBCT, and then a comparison to the planned original rectal dose. Results The created CTV1and CTV2 intersection percentage with the original CTV1and CTV2 significantly increased by 85%(range, 65%–95%, P < 0.05), when fiducial markers were used. The main difference of the received mean dose was significantly less in comparison to pelvic bone alignment(0.03% to 2% vs 0.03% to 11.6% for PTV1a, P < 0.006;0.01% to 1.8% vs 0.03% to 10.2% for PTV2a, P < 0.014;0.08 to 2.11 vs 0.04 to 11.29 for PTV1b, P < 0.015 and 0.01 to 1.79 vs 0.01 to 9.69 for PTV2b, P < 0.004). With the use of less PTV margins, significant decrease of the rectal mean dose, V60, V70 and V74 by P < 0.004, P < 0.004, P < 0.0005 and P < 0.009, respectively. Reduction of the CTV1a and CTV1b mean dose by 1.13% and 0.28% in comparison to the initial CTV1a and CTV2a.Conclusion A significant improvement of prostatic cancer patients alignment when fiducial markers are used, with more homogenous dose distribution, and with significant decrease in PTV margins. The delivered rectal dose is significantly less allowing prostate dose escalation. | Hussein M.Metwally | 2019 | Oncology and Translational Medicine2019，5，3： | 0 |
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