Study on image quality of radiograph in radiographic examination for circumferential welded joint (Report 1) — basic study on scattered radiation in double wall exposure technique

1997 ◽  
Vol 30 (6) ◽  
pp. 406
Keyword(s):  
Image Quality ◽  
Scattered Radiation ◽  
Welded Joint ◽  
Radiographic Examination ◽  
Basic Study ◽  
Exposure Technique ◽  
Double Wall ◽  
Joint Report

scholarly journals X-Rays through the Looking Glass: Mobile Imaging Dosimetry and Image Quality of Suspected COVID-19 Patients

2021 ◽  
Vol 46 (3) ◽  
pp. 120-126
Author(s):  
Alexandra Schelleman ◽  
Chris Boyd
Keyword(s):  
Image Quality ◽  
Scattered Radiation ◽  
X Rays ◽  
High Exposure ◽  
X Ray ◽  
Air Kerma ◽  
X Ray Imaging ◽  
Exposure Levels ◽  
Exposure Technique

Background: This paper aims to evaluate the clinical utility and radiation dosimetry, for the mobile X-ray imaging of patients with known or suspected infectious diseases, through the window of an isolation room. The suitability of this technique for imaging coronavirus disease 2019 (COVID-19) patients is of particular focus here, although it is expected to have equal relevance to many infectious respiratory disease outbreaks.Materials and Methods: Two exposure levels were examined, a “typical” mobile exposure of 100 kVp/1.6 mAs and a “high” exposure of 120 kVp/5 mAs. Exposures of an anthropomorphic phantom were made, with and without a glass window present in the beam. The resultant phantom images were provided to experienced radiographers for image quality evaluation, using a Likert scale to rate the anatomical structure visibility.Results and Discussion: The incident air kerma doubled using the high exposure technique, from 29.47 μGy to 67.82 μGy and scattered radiation inside and outside the room increased. Despite an increase in beam energy, high exposure technique images received higher image quality scores than images acquired using lower exposure settings.Conclusion: Increased scattered radiation was very low and can be further mitigated by ensuring surrounding staff are appropriately distanced from both the patient and X-ray tube. Although an increase in incident air kerma was observed, practical advantages in infection control and personal protective equipment conservation were identified. Sites are encouraged to consider the use of this technique where appropriate, following the completion of standard justification practices.

Observability of Very Thick Specimen by Using Transmission Scanning Electron Microscope

1971 ◽  
Vol 29 ◽  
pp. 26-27
Author(s):  
K. Shibatomi ◽  
T. Yamanoto ◽  
H. Koike
Keyword(s):  
Electron Microscope ◽  
Image Quality ◽  
Scanning Electron Microscope ◽  
Chromatic Aberration ◽  
Image Contrast ◽  
Objective Lens ◽  
Thick Specimen ◽  
Transmission Electron ◽  
Scanning Electron

In the observation of a thick specimen by means of a transmission electron microscope, the intensity of electrons passing through the objective lens aperture is greatly reduced. So that the image is almost invisible. In addition to this fact, it have been reported that a chromatic aberration causes the deterioration of the image contrast rather than that of the resolution. The scanning electron microscope is, however, capable of electrically amplifying the signal of the decreasing intensity, and also free from a chromatic aberration so that the deterioration of the image contrast due to the aberration can be prevented. The electrical improvement of the image quality can be carried out by using the fascionating features of the SEM, that is, the amplification of a weak in-put signal forming the image and the descriminating action of the heigh level signal of the background. This paper reports some of the experimental results about the thickness dependence of the observability and quality of the image in the case of the transmission SEM.

Organ doses and subjective image quality of indirect digital panoramic radiography

2001 ◽  
Vol 30 (6) ◽  
pp. 308-313 ◽  
Author(s):  
F Gijbels ◽  
G Sanderink ◽  
C Bou Serhal ◽  
H Pauwels ◽  
R Jacobs
Keyword(s):  
Image Quality ◽  
Panoramic Radiography ◽  
Organ Doses ◽  
Subjective Image Quality ◽  
Digital Panoramic Radiography

Model Kajian Pesantren: Studi Kritis terhadap Buku Dinamika Sistem Pendidikan Pesantren karya Mastuhu

1970 ◽  
Vol 11 (3) ◽  
pp. 408-421
Author(s):  
Fauzi Fauzi
Keyword(s):  
Educational System ◽  
Education System ◽  
Human Life ◽  
Great Contribution ◽  
Basic Study ◽  
Work Content ◽  
Study Approach ◽  
Cultural Aspect ◽  
Religious Aspect

As typical Indonesian education institute, pesantren with all its component, tradition, culture, and uniqueness have drawn attention many expert and researchers. Pesantren existence has given great contribution to enhancement of the quality of human life. Many role have been played by pesantren; in social, political, economics, cultural aspect; and of course religious aspect which its basic study. These realities in turn have invited the attention of many circles to continuously examine, checking, or studying dynamics, growth, and also existence of pesantren. Among the study result is Mastuhu’s research: Dynamics of System of Education Pesantren, a Study about Element and Value of Pesantren Educational System. With this masterpiece, Mastuhu trying to promote the form of study pesantren which do not merely touching manifest (visible) aspect, but trying to find the values which is consisted inside that manifest; so can found positive, negative, and plus-minus items from pesantren’s education which need and needn’t to be developed in national’s education system. Through this article, the writer will express the work content from a perspective of its study approach.

Image Quality Enhancing by Efficient Histogram Equalization

2014 ◽  
Vol 2 (2) ◽  
pp. 47-58
Author(s):  
Ismail Sh. Baqer
Keyword(s):  
Image Quality ◽  
Contrast Enhancement ◽  
Mean Squared Error ◽  
Signal To Noise Ratio ◽  
Histogram Equalization ◽  
Gray Level ◽  
Signal To Noise ◽  
Squared Error ◽  
Noise Ratio

A two Level Image Quality enhancement is proposed in this paper. In the first level, Dualistic Sub-Image Histogram Equalization DSIHE method decomposes the original image into two sub-images based on median of original images. The second level deals with spikes shaped noise that may appear in the image after processing. We presents three methods of image enhancement GHE, LHE and proposed DSIHE that improve the visual quality of images. A comparative calculations is being carried out on above mentioned techniques to examine objective and subjective image quality parameters e.g. Peak Signal-to-Noise Ratio PSNR values, entropy H and mean squared error MSE to measure the quality of gray scale enhanced images. For handling gray-level images, convenient Histogram Equalization methods e.g. GHE and LHE tend to change the mean brightness of an image to middle level of the gray-level range limiting their appropriateness for contrast enhancement in consumer electronics such as TV monitors. The DSIHE methods seem to overcome this disadvantage as they tend to preserve both, the brightness and contrast enhancement. Experimental results show that the proposed technique gives better results in terms of Discrete Entropy, Signal to Noise ratio and Mean Squared Error values than the Global and Local histogram-based equalization methods

Sign in / Sign up

Export Citation Format

Share Document