Yttrium-tantalate-based phosphors for x-ray intensifying screen

2004 ◽  
Author(s):  
Amalia Hristea ◽  
Elisabeth-Jeanne Popovici ◽  
Laura Muresan ◽  
Rodica Grecu ◽  
Laura Silaghi-Dumitrescu ◽  
...  
Keyword(s):  
X Ray ◽  
Intensifying Screen

scholarly journals Kajian Sistem Radiografi Digital sebagai Pengganti Sistem Computed Radiography yang Mahal (Halaman 40 s.d. 43)

2014 ◽  
Vol 17 (50) ◽  
Author(s):  
Susilo ◽  
Sunarno ◽  
I Ketut Swakarma ◽  
Rudi Setiawan ◽  
Edy Wibowo
Keyword(s):  
Computed Radiography ◽  
X Ray ◽  
Single Lens ◽  
Intensifying Screen

Sisitem radiografi diagnostic yang ada pada bagian radiologi Rumah Sakit Daerah (RSD) atau Puskesmas di Indonesia umumnya masih menggunakan system Radiografi Konvensional (RK) dengan film radiograf sebagai media penangkap citra. Berbeda dengan system Computed Radiography (CR)  tanpa film (filmless) yang sudah ada di RS tipe A atau RS maju di kota-kota besar. Dalam studi sebelumnya telah dilakukan pencitraan system radiografi digital  diagnostic berbasis X-Ray Intensifying Screen, diperoleh file radiograf digital dengan resolusi rendah, sehingga kalau dibesarkan citra radiograf menjadi pecah. Pada studi kali ini telah dikaji kemungkinan penggunaan kamera digital jenis single lens reflex pada  ruang kedap cahaya. Hasil eksperimen diperoleh hasil file radiograf digital dengan resoluasi lebih tinggi dibanding sebelumnya. Kajian ini bisa dikembangkan menjadi system radiografi digital dengan memodifikasi unit penangkat gambar pada sistem RK, sehingga sistem ini bisa menjembatani antara pembacaan radiograf analog menggunakan film menjadi file radiograf digital, sekaligus sebagai pengganti sistem CR  yang relative mahal.

An Improved X-Ray Intensifying Screen

1972 ◽  
Vol 19 (1) ◽  
pp. 81-86 ◽  
Author(s):  
Robert A. Buchanan
Keyword(s):  
X Ray ◽  
Intensifying Screen

Improvement of x-ray intensifying screen efficiency by special design of the screen.

Radiology ◽  
1982 ◽  
Vol 142 (1) ◽  
pp. 229-231 ◽  
Author(s):  
E J Riihimäki ◽  
O A Korhola ◽  
H T Suoranta ◽  
M K Valle
Keyword(s):  
Special Design ◽  
X Ray ◽  
Intensifying Screen

scholarly journals Estimation of the effective focal spot sizes in medical diagnostic X-ray tube assemblies

2016 ◽  
Vol 22 (2) ◽  
pp. 25-33 ◽  
Author(s):  
Iwona Grabska ◽  
Ewa Fabiszewska ◽  
Katarzyna Pasicz ◽  
Witold Skrzyński
Keyword(s):  
Focal Spot ◽  
Input Power ◽  
Measurement Time ◽  
X Ray ◽  
Tube Current ◽  
Width Measurement ◽  
Medical Diagnostic ◽  
Intensifying Screen ◽  
Current Value

Abstract For evaluation of the effective focal spot sizes (EFSS), a method suggested by the EN 60336:2005 standard (standard) could be used. In this study we checked whether it is possible to make some deviations from the requirements of the standard without a significant effect on the result. An image receptor with one intensifying screen or two intensifying screens may be used, but the optical value of the slit image shall be in the range of 1.0÷1.4 and the X-ray tube power shall be ranged of about 30%÷50% of the nominal anode input power. A precision scaled magnifier (magnification of 5÷10x and scale of 0.1 mm) may be used for the slit radiogram width measurement instead of a time-consuming scanning of the slit radiogram. These deviations from the requirements of the EN 60336:2005 standard allows to shorten measurement time and to decrease tube current value during X-ray exposures, which reduces the risk of the Xray tube damage.

Space and Time Distribution of Hard X-Ray Emission in a Loop at the Beginning of a Flare

1994 ◽  
Vol 144 ◽  
pp. 275-277
Author(s):  
M. Karlický ◽  
J. C. Hénoux
Keyword(s):  
Time Distribution ◽  
Electron Bombardment ◽  
Spatial Evolution ◽  
Superthermal Electrons ◽  
Flare Loop ◽  
X Ray ◽  
Superthermal Electron ◽  
Flare Loops ◽  
Chromospheric Evaporation ◽  
Temporal And Spatial

AbstractUsing a new ID hybrid model of the electron bombardment in flare loops, we study not only the evolution of densities, plasma velocities and temperatures in the loop, but also the temporal and spatial evolution of hard X-ray emission. In the present paper a continuous bombardment by electrons isotropically accelerated at the top of flare loop with a power-law injection distribution function is considered. The computations include the effects of the return-current that reduces significantly the depth of the chromospheric layer which is evaporated. The present modelling is made with superthermal electron parameters corresponding to the classical resistivity regime for an input energy flux of superthermal electrons of 109erg cm−2s−1. It was found that due to the electron bombardment the two chromospheric evaporation waves are generated at both feet of the loop and they propagate up to the top, where they collide and cause temporary density and hard X-ray enhancements.

Some Problems in Understanding the Solar Corona

1994 ◽  
Vol 144 ◽  
pp. 1-9
Author(s):  
A. H. Gabriel
Keyword(s):  
Solar Corona ◽  
Solar Atmosphere ◽  
Theoretical Modelling ◽  
Total System ◽  
Major Advance ◽  
X Ray ◽  
Proper Perspective ◽  
Space Observations

The development of the physics of the solar atmosphere during the last 50 years has been greatly influenced by the increasing capability of observations made from space. Access to images and spectra of the hotter plasma in the UV, XUV and X-ray regions provided a major advance over the few coronal forbidden lines seen in the visible and enabled the cooler chromospheric and photospheric plasma to be seen in its proper perspective, as part of a total system. In this way space observations have stimulated new and important advances, not only in space but also in ground-based observations and theoretical modelling, so that today we find a well-balanced harmony between the three techniques.

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