scholarly journals In-bore prostate transperineal interventions with an MRI-guided parallel manipulator: system development and preliminary evaluation

2015 ◽  
Vol 12 (2) ◽  
pp. 199-213 ◽  
Author(s):  
Sohrab Eslami ◽  
Weijian Shang ◽  
Gang Li ◽  
Nirav Patel ◽  
Gregory S. Fischer ◽  
...  
Keyword(s):  
Parallel Manipulator ◽  
System Development ◽  
Preliminary Evaluation ◽  
Mri Guided

Status of the Army Closed-Brayton-Cycle Gas Turbine Program

1967 ◽  
Author(s):  
John A. Bailey ◽  
Franklin D. Jordan ◽  
Carey A. Kinney
Keyword(s):  
Gas Turbine ◽  
System Development ◽  
Power Conversion ◽  
Preliminary Evaluation ◽  
Brayton Cycle ◽  
Experimental Facility ◽  
Test Results ◽  
The Status ◽  
Component Development ◽  
History Of

A very brief history of the Army closed-Brayton-cycle gas turbine program is presented as background for discussion of the status and recent test results at the Advanced Power Conversion Experimental Facility at Fort Belvoir. The APCEF program is intended to emphasize component development in contrast to system development at the Advanced Power Conversion Skid Experiment (APCSE) at San Ramon, Calif. The APCEF is described along with the components being tested, experimental test results are discussed and analyzed, and a preliminary evaluation is presented.

Preliminary Evaluation of Hydraulic Needle Delivery System for MRI Guided Prostate Biopsy Procedures

2021 ◽  
Author(s):  
Davut Ibrahim Mahcicek ◽  
Dursun Korel Yildirim ◽  
Gokce Kasaci ◽  
Ozgur Kocaturk
Keyword(s):  
Delivery System ◽  
Prostate Biopsy ◽  
Transrectal Ultrasound ◽  
Preliminary Evaluation ◽  
Biopsy Needle ◽  
Biopsy Procedure ◽  
Mri Guidance ◽  
Diagnose Prostate Cancer ◽  
Mri Guided

Abstract In clinical routine, the prostate biopsy procedure is performed with the guidance of transrectal ultrasound (TRUS) imaging to diagnose prostate cancer. However, the TRUS-guided prostate biopsy brings reliability concerns due to the lack of contrast difference between prostate tissue and lesions. In this study, a novel hydraulic needle delivery system that is designed for performing MRI-guided prostate biopsy procedure with transperineal approach is introduced. The feasibility of the overall system was evaluated through in-vitro phantom experiments under an MRI guidance. The in vitro experiments performed using a certified prostate phantom (incorporating MRI visible lesions). MRI experiments showed that overall hydraulic biopsy needle delivery system has excellent MRI compatibility (SNR Loss < 3%), provides acceptable targeting accuracy (average 2.05±0.46 mm) and procedure time (average 40 minutes).

scholarly journals Development and Preliminary Evaluation of a Motorized Needle Guide Template for MRI-Guided Targeted Prostate Biopsy

2013 ◽  
Vol 60 (11) ◽  
pp. 3019-3027 ◽  
Author(s):  
Sang-Eun Song ◽  
Junichi Tokuda ◽  
Kemal Tuncali ◽  
Clare M. Tempany ◽  
Elizabeth Zhang ◽  
...  
Keyword(s):  
Prostate Biopsy ◽  
Preliminary Evaluation ◽  
Mri Guided

Cross-sectional TEM specimen preparation from magneto-optical disk by ultramicrotomy

1993 ◽  
Vol 51 ◽  
pp. 236-237
Author(s):  
F. Shaapur ◽  
M.J. Kim ◽  
Seh Kwang Lee ◽  
Soon Gwang Kim
Keyword(s):  
System Development ◽  
Thin Foil ◽  
Specimen Preparation ◽  
Material System ◽  
Cross Sectional ◽  
Protective Layers ◽  
New Material ◽  
Diamond Saw ◽  
Original Production ◽  
Thick Medium

TEM characterization and microanalysis of the recording media is crucial and complementary to new material system development as well as quality control applications. Due to the type of material generally used for supporting the medium, i.e., a polymer, conventional macro- and microthinning procedures for thin foil preparation are not applicable. Ultramicrotorny (UM) is a viable option and has been employed in previous similar studies. In this work UM has been used for preparation of XTEM samples from a magneto-optical (MO) recording medium in its original production format.The as-received material system consisted of a 4-layer, 2100 Å thick medium including a 300 Å TbFeCo layer enveloped by silicon nitride protective layers supported on a 1.2 mm thick × 135 mm (5.25 in.) diameter polycarbonate disk. Recording tracks had an approximate pitch of 1.6 μm separated by 800 Å deep peripheral grooves. Using a Buehler Isomet low-speed diamond saw, 1 mm wide and 20 mm long strips were cut out of the disk along the recording tracks.

Preliminary Evaluation of a Weibull Function for Fitting Slow-Component Eye Velocity over the Time Course of Caloric-Induced Nystagmus

1989 ◽  
Vol 32 (3) ◽  
pp. 681-687 ◽  
Author(s):  
C. Formby ◽  
B. Albritton ◽  
I. M. Rivera
Keyword(s):  
Time Course ◽  
Slow Component ◽  
Weibull Function ◽  
Preliminary Evaluation ◽  
Mathematical Function ◽  
Before And After ◽  
Best Fitting ◽  
Eye Velocity ◽  
Fitting Parameters ◽  
Weibull Equation

We describe preliminary attempts to fit a mathematical function to the slow-component eye velocity (SCV) over the time course of caloric-induced nystagmus. Initially, we consider a Weibull equation with three parameters. These parameters are estimated by a least-squares procedure to fit digitized SCV data. We present examples of SCV data and fitted curves to show how adjustments in the parameters of the model affect the fitted curve. The best fitting parameters are presented for curves fit to 120 warm caloric responses. The fitting parameters and the efficacy of the fitted curves are compared before and after the SCV data were smoothed to reduce response variability. We also consider a more flexible four-parameter Weibull equation that, for 98% of the smoothed caloric responses, yields fits that describe the data more precisely than a line through the mean. Finally, we consider advantages and problems in fitting the Weibull function to caloric data.

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