background : in recent years tissue engineering developed to replace or repair damaged tissues using cell and biomaterial. one of the most important fields of tissue engineering is simulation of in vivo micro environment of body tissues. this study aimed to develop culture chamber and cell biomaterial sheet engineering for the reconstruction of cartilage tissue. methods : stainless steel cultur...

introduction for dose measurement in megavoltage (mv) photon beams with ion chambers, the effect of volume occupied by the air cavity is not negligible. therefore, the result of measurement should be corrected with a displacement perturbation correction factor (pdis) or using an effective point of measurement (epom). the aim of this study is to calculate the epom for cylindrical ion chamber and...

introduction computed tomography scans are a very important tool for diagnosis and assessment of response to treatment in the practice of medicine. ionizing radiation in medical imaging is undoubtedly one of the most powerful diagnostic tools in medicine. yet, as with all medical interventions, there are potential risks in addition to the clear potential benefits. materials and methods two refe...

The feasibility of single isocenter, multi-arc non-coplanar volumetric modulated arc therapy (VMAT) for multiple brain tumors was studied using an Elekta Synergy linear accelerator with an Agility multileaf collimator and a Monaco treatment planning system. Two VMAT radiosurgery plans consisting of a full arc and three half arcs were created with a prescribed dose of 20 Gy in a single fraction....

PURPOSE To investigate the sensitivity of traditional gamma-index-based analysis using diode arrays to detect significant dosimetric errors in patientspecific measurements for VMAT brain SRT plans. METHODS Quality assurance measurements were performed using an ion chamber and two different diode array devices for four brain SRT treatment plans. All cases were planned with Eclipse AAA RapidArc...

Purpose The magnetic-field correction factors of compact air-filled ionization chambers have been investigated experimentally and using Monte Carlo simulations up to 1.5 T. role the nonsensitive region within air cavity influence chamber construction on its dose response elucidated. Materials Methods PTW Semiflex 3D 31021, PinPoint 31022, Sun Nuclear Cooperation SNC125c were studied. measured a...

Future Madplanets explorations call forp recision and even pinpoint landing. Low cost optical correlatori s one of the promising enabling technologies for pinpoint landing. JPL has developed a state-of-the-art miniature optical correlator (MOC) to demonstrate its feasibility. In this paper, we describe a simulation testbed underd evelopment for measuring MOC’s perfonnance in a high-fidelity ent...

The combination of LSS and SIfT in Phase 1 of our project helped us pinpoint opportunities for significant, measurable energy reductions in the areas of server load and cooling load. We studied power usage at one mature data center. The combination of LSS and SIfT in Phase 1 of our project helped us pinpoint opportunities for significant, measurable energy reductions in the areas of server load...