Blinded Evaluation of the Effects of High Definition and Magnification on Perceived Image Quality in Laryngeal Imaging

2006 ◽  
Vol 115 (2) ◽  
pp. 110-113 ◽  
Author(s):  
Kristen J. Otto ◽  
Edie R. Hapner ◽  
Michael Baker ◽  
Michael M. Johns
Keyword(s):  
Image Quality ◽  
High Definition ◽  
Laryngeal Imaging

Wireless video transmission into the MRI magnet room: implementation and evaluation at 1.5T, 3T and 7T

2019 ◽  
Vol 64 (4) ◽  
pp. 373-382
Author(s):  
Bennet Hensen ◽  
Urte Kägebein ◽  
Marcel Gutberlet ◽  
Kristina I. Ringe ◽  
Van Dai Vo-Chieu ◽  
...  
Keyword(s):  
Image Quality ◽  
Video Transmission ◽  
Continuous Wave ◽  
Signal To Noise Ratio ◽  
Noise Spectrum ◽  
Video Stream ◽  
Wireless Video ◽  
High Definition ◽  
Wireless Video Transmission ◽  
Field Strengths

Abstract Purpose To analyze the interference between a wireless high definition multimedia interface (WHDMI) and magnetic resonance imaging (MRI) image quality at 1.5T, 3T and 7T. Materials and methods A wireless video transmission system (WVTS) consisting of a WHDMI and a projector was used to transmit and display a video stream into the magnet room. MR image quality was analyzed at 1.5T, 3T and 7T. Signal-to-noise-ratio $(\overline {{\rm{SNR}}} )$ and radio frequency (RF)-noise spectrum were measured at three transmitter positions (A: inside the cabin, B: in front of the waveguide and C: in the control room). WVTS system functionality tests included measurements of reliability, delay and image quality. Results With the WVTS mean $\overline {{\rm{SNR}}} $ values significantly decreased in comparison to the reference for all positions and fieldstrenghts, while the spectra’s baseline is elevated at 1.5T and 3T. Peaks related to continuous wave interferences are apparent at all field strenghts. For WHDMI alone mean $\overline {{\rm{SNR}}} $ values were stable without significant differences to the reference. No elevation of the spectra’s baseline could be observed. Functionality measurements confirmed high connection reliability with stable image quality and no delays for all field strengths. Conclusion We conclude that wireless transmission of video streams into the MRI magnet room is feasible at all field strengths without hampering image quality.

High-Definition Video System for Peripheral Neurorrhaphy in Rats

2017 ◽  
Vol 24 (4) ◽  
pp. 369-372 ◽  
Author(s):  
Rui Sergio Monteiro de Barros ◽  
Marcus Vinicius Henriques Brito ◽  
Renan Kleber Costa Teixeira ◽  
Vitor Nagai Yamaki ◽  
Felipe Lobato da Silva Costa ◽  
...  
Keyword(s):  
Image Quality ◽  
Wistar Rats ◽  
Low Cost ◽  
High Definition ◽  
Surgical Time ◽  
Video System ◽  
Image Magnification ◽  
High Definition Video ◽  
Video Assisted ◽  
Video Systems

Background: Although all microsurgeries are based on the use of surgical microscopes, several alternative magnification systems have shown promising results. Improvements in image quality facilitated the use of video systems in microsurgeries with safety and accuracy. The aim of this study was to evaluate the use of a low-cost, video-assisted magnification system in peripheral neurorrhaphy in rats. Methods: Twenty Wistar rats were randomly divided into 2 matched groups according to the magnification system used: the microscope group, with neurorrhaphy performed under a microscope with an image magnification of 40×; and the video system group, with the procedures performed under a video system composed of a high-definition Sony camcorder DCR-SR42 set to 52× magnification, macro lenses, 42-inch television, and a digital HDMI cable. We analyzed weight, nerve caliber, total surgery time, neurorrhaphy time, number of stitches, and number of axons in both ends (proximal and distal). Results: There were no significant differences between groups in weight, nerve caliber, or number of stitches. Neurorrhaphy under the video system took longer (video: 5.60 minutes; microscope: 3.20 minutes; P < .05). Number of axons was similar between groups, both in proximal and distal stumps. Conclusion: It is possible to perform a peripheral neurorrhaphy in rats through video system magnification, but with a longer surgical time.

OPTIMISATION OF PATIENT DOSE AND IMAGE QUALITY IN FLUOROSCOPICALLY GUIDED CERVICAL SPINE SURGERY: A PHANTOM-BASED STUDY

2018 ◽  
Vol 184 (2) ◽  
pp. 237-247 ◽  
Author(s):  
Vasileios I Metaxas ◽  
Gerasimos A Messaris ◽  
George D Gatzounis ◽  
George S Panayiotakis
Keyword(s):  
Image Quality ◽  
Spinal Surgery ◽  
Patient Dose ◽  
Skin Dose ◽  
High Contrast ◽  
Operational Parameters ◽  
High Definition ◽  
Low Contrast ◽  
Cervical Spine Surgery ◽  
Noise Ratio

Abstract The purpose of the current study was to provide useful data, which may help neurosurgeons to manage the patient dose and image quality in spinal surgery procedures, utilising a phantom and a test object. The kerma area product, cumulative dose (CD) and entrance surface dose (ESD) rate on the phantom and image intensifier were measured, for selectable fields of view (FOVs), fluoroscopy modes, two geometric magnifications and various phantom thicknesses. The images were subjectively evaluated regarding low-contrast detectability and high-contrast resolution. Signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), high-contrast spatial resolution (HCSR) and figure of merit (FOM) values were also estimated. The ESD rates increased with increasing phantom thickness, when using electronic or geometric magnification, continuous or high-definition fluoroscopy (HDF). The observers’ evaluation showed relatively slight changes in image quality when pulsed fluoroscopy was used. SNR, CNR and HCSR values decreased with increasing phantom thicknesses, while remained almost constant when using pulsed fluoroscopy. SNR and HCSR improved in HDF, while the CNR remained almost constant only for the FOVs 23 and 17 cm. By applying electronic magnification, this resulted in improved HCSR. FOM values decreased in HDF, with increasing phantom thickness and using electronic magnification. For the ‘thinnest’ patients, CD may overestimate skin dose by 25% than the actual values. Geometric magnification resulted in improved FOM, especially for low-dose fluoroscopy and FOV 23 cm. The knowledge of the increments in dose values, image quality and FOM indices concerning phantom thickness may help neurosurgeons to optimise spinal surgery procedures by selecting the appropriate operational parameters, which could contribute toward the establishment of a radiation protection culture.

scholarly journals A High-Definition Diversity-Scene Database for Image Quality Assessment

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 45427-45438 ◽  
Author(s):  
Tsung-Jung Liu ◽  
Hsin-Hua Liu ◽  
Soo-Chang Pei ◽  
Kuan-Hsien Liu
Keyword(s):  
Image Quality ◽  
Quality Assessment ◽  
Image Quality Assessment ◽  
High Definition

scholarly journals Gynecological Tumors Image using High Definition Ultrasound (HDlive US)

2014 ◽  
Vol 8 (2) ◽  
pp. 155-163
Author(s):  
Francisco Raga ◽  
Francisco Bonilla ◽  
Fernando Bonilla-Musoles ◽  
Juan Carlos Castillo ◽  
Oscar Caballero Luna
Keyword(s):  
Image Quality ◽  
Gold Standard ◽  
Obstet Gynecol ◽  
3D Ultrasound ◽  
Two Dimensional ◽  
High Definition ◽  
Gynecological Tumors ◽  
Ultrasound Technology ◽  
And Control

ABSTRACT Abdominal and/or vaginal two-dimensional (2D) and threedimensional (3D) ultrasound (US) are the ‘gold standard’ technology on which diagnosis and control of gynecological tumors depend. In recent years a series of software that initially generated enormous interest, have been introduced to improve 2D/3D US image quality and diagnostic accuracy. Many of them have shown limited interests. The last one and the most interesting is HDlive which incorporates a movable virtual adjustable light that, as it penetrates, produces selective illumination with respective shadows that result from the structures where light is reflected. This combination of lights and shadows results in spectacular images which are much more real than those obtained with conventional 3D US. This note simply pretends to show the quality of images obtained in cases of gynecological tumors using this easy-tohandle high definition ultrasound technology. How to cite this article Bonilla-Musoles F, Raga F, Bonilla F Jr, Castillo JC, Luna OC. Gynecological Tumors Image using High Definition Ultrasound (HDlive US). Donald School J Ultrasound Obstet Gynecol 2014;8(2):155-163.

scholarly journals Analysis of the Application Value of X-Ray Digital Tomographic Fusion Technique in Urinary System Diseases

2022 ◽  
Vol 2022 ◽  
pp. 1-5
Author(s):  
Chensi Ouyang ◽  
Xiufang Yang ◽  
Jinghong Xie ◽  
Jinqiang Hu
Keyword(s):  
Image Quality ◽  
Urinary Calculi ◽  
Plain Film ◽  
Fusion Imaging ◽  
Ureteral Stricture ◽  
Urinary System ◽  
High Definition ◽  
Accuracy Rate ◽  
Fusion Technique ◽  
X Ray

Objective. To explore the application value of the X-ray digital tomographic fusion technique in the diagnosis of urinary system diseases. Methods. 500 patients with suspected urinary diseases in our hospital were examined by three methods: X-ray digital tomographic fusion imaging (DTS), intravenous pyelography (IVP), and abdominal plain film (KUB), and the image quality before and after tomographic fusion was objectively evaluated. The image quality could be divided into three grades: excellent, good, and poor. Results. The image excellent rate of DTS (88%) was higher than that of IVP (27.5%). The sensitivity of DTS in the diagnosis of renal cyst and space occupying of the bladder was higher than that of IVP ( P < 0.05 ). The accuracy rate of DTS in the diagnosis of urinary calculi was 93.33%, higher than 63.3% of KUB ( P < 0.001 ). The accuracy rate of DTS in the diagnosis of ureteral stricture was 90%, higher than 65% of IVP ( P = 0.03 ). The accuracy of DTS in the diagnosis of hydronephrosis was higher than that of IVP and KUB ( P < 0.05 ). Conclusion. In the examination of urinary system-related diseases, high-definition images can be obtained by timely using sectional fusion technology. Compared with conventional IVP, space occupying lesions such as the bladder and kidney can be displayed more clearly with the help of the tomographic fusion technique, which is helpful to improve the possibility of finding lesions and is of great significance in clinical application.

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