Multibeam Phased Array with Dynamic Focusing and Improved Image Quality

1996 ◽  
pp. 483-488
Author(s):  
S. G. Mesochorianakis ◽  
J. I. Burov ◽  
V. L. Strashilov ◽  
M. G. Christov
Keyword(s):  
Image Quality ◽  
Phased Array

scholarly journals Plane Wave Imaging through Interfaces

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 4967
Author(s):  
Guillermo Cosarinsky ◽  
Jorge F. Cruza ◽  
Jorge Camacho
Keyword(s):  
Image Quality ◽  
Plane Wave ◽  
Phased Array ◽  
Mathematical Formulation ◽  
Non Destructive Testing ◽  
Arbitrary Geometry ◽  
Destructive Testing ◽  
Wave Imaging ◽  
Imaging Strategy ◽  
Non Destructive

Plane Wave Imaging (PWI) has been recently proposed for fast ultrasound inspections in the Non-Destructive-Testing (NDT) field. By using a single (or a reduced number) of plane wave emissions and parallel beamforming in reception, frame rates of hundreds to thousands of images per second can be achieved without significant image quality losses with regard to the Total Focusing Method (TFM) or Phased Array (PA). This work addresses the problem of applying PWI in the presence of arbitrarily shaped interfaces, which is a common problem in NDT. First, the mathematical formulation for generating a plane wave inside a component of arbitrary geometry is given, and the characteristics of the resultant acoustic field are analyzed by simulation, showing plane wavefronts with non-uniform amplitude. Then, an imaging strategy is proposed, accounting for this amplitude effect. Finally, the proposed method is experimentally validated, and its application limits are discussed.

Pelvic phased array coil: Image quality assessment for spin-echo MR imaging

1992 ◽  
Vol 10 (4) ◽  
pp. 513-522 ◽  
Author(s):  
Thomas R. McCauley ◽  
Shirley McCarthy ◽  
Robert Lange
Keyword(s):  
Image Quality ◽  
Mr Imaging ◽  
Quality Assessment ◽  
Phased Array ◽  
Image Quality Assessment ◽  
Spin Echo ◽  
Phased Array Coil ◽  
Array Coil

scholarly journals PERBEDAAN KUALITAS CITRA MRI LUMBAL SEKUEN TIWI TSE POTONGAN SAGITAL DENGAN DAN TANPA PENGGUNAAN SENSITIVITY ENCODING (SENSE) PADA KASUS HERNIA NUCLEUS PULPOSUS

2020 ◽  
Vol 6 (1) ◽  
pp. 16-22
Author(s):  
Rini Indrati ◽  
Iin Saputri Sahlan ◽  
Bambang Satoto ◽  
Siti Daryati
Keyword(s):  
Image Quality ◽  
Nucleus Pulposus ◽  
Phased Array ◽  
P Value ◽  
Sensitivity Encoding ◽  
Lumbar Mri ◽  
The Difference ◽  
Anatomical Information ◽  
Phased Array Coils ◽  
Array Coils

Background: Parallel imaging is a time-reduction technique that uses phased-array coils. Phased array coils measure and process signals from a piece, then combine pieces to form an image of a larger area of anatomy. Commonly used imaging parallel technique is one of them is sensitivity encoding or SENSE. This research is the difference of image quality MRI Lumbal sequence T1WI TSE of sagittal pieces with and without the use of SENSE in the case of hernia nucleus pulposus (HNP). The aim of this research is to know the difference between SNR, anatomy information and better image quality and anatomical information. MRI Lumbal sequence T1WI TSE sagittal pieces with and without the SENSE in HNP.Methods: The type of this research is quantitative with an experimental approach, The research was conducted in RS dr. Saiful Anwar Malang. The research was taken from Lumbal MRI examination in 9 patients with predetermined exclusion and inclusion criteria of T1WI TSE sectional pieces with and without the use of SENSE in HNP. Image assessment was done by two radiologists. Analysis of data used paired T-test and Wilcoxon test with alpha 5%.Results: The results showed that there was a difference in image quality of MRI Lumbal T1WI TSE sequence of sagittal pieces with and without the use of SENSE in HNP with p-value = 0.001, and anatomic information with p-value = 0.001. Sensitivity encoding resulted in better image quality and anatomical information, with mean values at SNR 181,4333, and rank information anatomy 11,00.Conclusion: There is a difference in SNR and anatomical information between the use of SENSE andwithout the use of SENSE on sagittal lumbar MRI. The use of SENSE is capable of producing quality MRIimagery (SNR) and Anatomical Information on lumbar MRI lumbar sequences of sagittal slices.

scholarly journals The Australian Square Kilometre Array Pathfinder: Performance of the Boolardy Engineering Test Array

2016 ◽  
Vol 33 ◽  
Author(s):  
D. McConnell ◽  
J. R. Allison ◽  
K. Bannister ◽  
M. E. Bell ◽  
H. E. Bignall ◽  
...  
Keyword(s):  
Image Quality ◽  
Radio Telescope ◽  
Phased Array ◽  
Aperture Synthesis ◽  
Imaging Procedures ◽  
Test Array ◽  
Square Kilometre Array ◽  
Performance Sensitivity ◽  
Beam Characteristics ◽  
Beam Aperture

AbstractWe describe the performance of the Boolardy Engineering Test Array, the prototype for the Australian Square Kilometre Array Pathfinder telescope. Boolardy Engineering Test Array is the first aperture synthesis radio telescope to use phased array feed technology, giving it the ability to electronically form up to nine dual-polarisation beams. We report the methods developed for forming and measuring the beams, and the adaptations that have been made to the traditional calibration and imaging procedures in order to allow BETA to function as a multi-beam aperture synthesis telescope. We describe the commissioning of the instrument and present details of Boolardy Engineering Test Array’s performance: sensitivity, beam characteristics, polarimetric properties, and image quality. We summarise the astronomical science that it has produced and draw lessons from operating Boolardy Engineering Test Array that will be relevant to the commissioning and operation of the final Australian Square Kilometre Array Path telescope.

scholarly journals MP16-12 COMPARISON OF IMAGE QUALITY AND PATIENT DISCOMFORT IN PROSTATE MRI: ENDORECTAL COIL VS. PELVIC PHASED ARRAY COIL

2016 ◽  
Vol 195 (4S) ◽  
Author(s):  
Borna K. Barth ◽  
Alexander Cornelius ◽  
Daniel Nanz ◽  
Daniel Eberli ◽  
Olivio F. Donati
Keyword(s):  
Image Quality ◽  
Phased Array ◽  
Prostate Mri ◽  
Patient Discomfort ◽  
Endorectal Coil ◽  
Phased Array Coil ◽  
Array Coil

Comparison of image quality and patient discomfort in prostate MRI: pelvic phased array coil vs. endorectal coil

2016 ◽  
Vol 41 (11) ◽  
pp. 2218-2226 ◽  
Author(s):  
Borna K. Barth ◽  
Alexander Cornelius ◽  
Daniel Nanz ◽  
Daniel Eberli ◽  
Olivio F. Donati
Keyword(s):  
Image Quality ◽  
Phased Array ◽  
Prostate Mri ◽  
Patient Discomfort ◽  
Endorectal Coil ◽  
Phased Array Coil ◽  
Array Coil

scholarly journals Surface coil intensity correction in magnetic resonance imaging in spinal metastases

Open Medicine ◽  
2017 ◽  
Vol 12 (1) ◽  
pp. 138-143 ◽  
Author(s):  
Hong Ren ◽  
Wei Lin ◽  
Xianjun Ding
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Image Quality ◽  
Signal Intensity ◽  
Reading Time ◽  
Phased Array ◽  
Spinal Metastases ◽  
Surface Coil ◽  
Resonance Imaging ◽  
T1 And T2

AbstractObjectiveTo evaluate the clinical application of phased-array surface coil intensity correction in magnetic resonance imaging (MRI) in spinal metastases.Methods3 phantoms and 50 patients with a corresponding total number of 80 spinal metastases were included in this study. Fast spin echo T1- and T2- weighted MRI with and without surface coil intensity correction was routinely performed for all phantoms and patients. Phantoms were evaluated by means of variance to mean ratio of signal intensity on both T1- and T2- weighted MRI obtained with and without surface coil intensity correction. Spinal metastases were evaluated by image quality scores; reading time per case on both T1- and T2- weighted MRI obtained with and without surface coil intensity correction.ResultsSpinal metastases were diagnosed more successfully on MRI with surface coil intensity correction than on MRI with conventional surface coil technique. The variance to mean ratio of signal intensity was 53.36% for original T1-weighted MRI and 53.58% for original T2-weighted MRI. The variance to mean ratio of signal intensity was reduced to 18.99% for T1-weighted MRI with surface coil intensity correction and 22.77% for T2-weighted MRI with surface coil intensity correction. The overall image quality scores (interface conspicuity of lesion and details of lesion) were significantly higher than those of the original MRI. The reading time per case was shorter for MRI with surface coil intensity correction than for MRI without surface coil intensity correction.ConclusionsPhased-array surface coil intensity correction in MRIs of spinal metastases provides improvements in image quality that leads to more successfully detection and assessment of spinal metastases than original MRI.

Progress In The Practical Application Of Automated Image Analysis To Tem Negatives

1977 ◽  
Vol 35 ◽  
pp. 214-217
Author(s):  
F. A. Heckman ◽  
E. Redman ◽  
J.E. Connolly
Keyword(s):  
Image Analysis ◽  
Image Quality ◽  
Exposure Time ◽  
Image Contrast ◽  
Automated Image Analysis ◽  
Practical Application ◽  
Factors Affecting ◽  
High Image Quality ◽  
Qualitative Evidence ◽  
Comprehensive Study

In our initial publication on this subject1) we reported results demonstrating that contrast is the most important factor in producing the high image quality required for reliable image analysis. We also listed the factors which enhance contrast in order of the experimentally determined magnitude of their effect. The two most powerful factors affecting image contrast attainable with sheet film are beam intensity and KV. At that time we had only qualitative evidence for the ranking of enhancing factors. Later we carried out the densitometric measurements which led to the results outlined below.Meaningful evaluations of the cause-effect relationships among the considerable number of variables in preparing EM negatives depend on doing things in a systematic way, varying only one parameter at a time. Unless otherwise noted, we adhered to the following procedure evolved during our comprehensive study:Philips EM-300; 30μ objective aperature; magnification 7000- 12000X, exposure time 1 second, anti-contamination device operating.

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