Electron Radiography: A New Method of Radiographie Imaging

Ap, Proudian; Rl, Carangi; Jacobson, George; Ep, Muntz

doi:10.1148/110.3.667

Cited by 17 publications

(4 citation statements)

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“…Ionography Johns 1974, Johns, Fenster, Plewes, Boag andJeffrey 1974)) or electron radiography as referred to by Xonics (Proudian, Carangi, Jacobson and Muntz 1974)) offers a new method of X-ray imaging for diagnostic radiology. It is similar to xeroradiography in that they are both electrostatic imaging systems that produce a charge distribution on a dielectric layer which is related to the X-ray exposure.…”

Section: Introductionmentioning

confidence: 99%

Edge contrast in ionography

Plewes¹,

Johns²

1978

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The effect of Mylar foil thickness on the appearance of ionography images has been investigated. Approximate expressions for the depletion width of strips and halfplanes of charge are given with supporting experimental measurements. In microdensitometer traces of charged strips and halfplanes the density is shown to be proportional to the vertical field profile of the charge pattern near the Mylar. This work suggests a simple means of altering edge contrast for ionography by using different thicknesses of Mylar. Ionography images of a hand phantom illustrate this effect.

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Section: Introductionmentioning

confidence: 99%

Edge contrast in ionography

Plewes¹,

Johns²

1978

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“…The Fourier transform of ujx,y) was given in Eq. (15) and may in cylindrical coordinates be expressed as…”

Section: Pea +Aepmentioning

confidence: 99%

“…12.13 Other groupsl4. 15 have utilized high pressure gas instead of air in a similar polarizing process to form latent electrostatic images without investigating the electret properties of such images. The electret depolarization by ionizing radiation was recently proposed as a radiation dosimetry technique.…”

Section: Introductionmentioning

confidence: 99%

Electrostatic fields in an ionization chamber electret

Fallone

Podgoršak

1983

Journal of Applied Physics

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The theory of linear systems is used to derive the potential and electric field in distance space in a cylindrical polarization/depolarization electret chamber. General solutions for the near, intermediate, and far regions are given and their domains of convergence discussed. On the axis of the chamber the solutions for the electret surface are equal to those obtained from Gauss’s and Kirchoff’s laws, and at large distances from the surface to those obtained from the introduction of a dipole layer model.

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“…[ 137 ] medium arose in several centres about the same time and has since been studied intensively in a num ber of laboratories and in more than one industrial company Reiss 1974;Stanton et al 1974;Proudian et al 1974;Peschmann & Grosche 1977;M untz et al 1 Xonics Inc. now have commercial mammographic equipment in clinical use. (b) B y ionography: 1, X-ray beam emerging from object; 2. carbon fibre top plate; 3, imaging gas; 4, insulat ing foil; 5, charge pattern due to the accumulated ions; 6, lower electrode at 10-20 kV positive or negative.…”

Section: H Istorymentioning

confidence: 99%

Electrostatic imaging in radiology: limitations and prospects

Boag

1979

Phil. Trans. R. Soc. Lond. A

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In this radiographic technique, the latent image takes the form of a surface distribution of electric charge which may be rendered visible in various ways. The charge distribution is formed either on a selenium surface (xeroradiography) or by collecting ions on an insulating foil (ionography). Conventional powder development techniques yield visible images in which high spatial frequencies are enhanced (‘edge contrast’) and low frequencies largely suppressed. This contrast pattern is useful for the radiological study of soft tissues, vascular structure, bones and joints. Xeroradiography is less sensitive than film-screen radiography and this restricts its medical application to sites where gonad exposure is minimal. Ionography with compressed xenon has high sensitivity but is not yet fully developed commercially. It requires a rigid link between the X-ray tube and the recording chamber. The latent image is produced on plastic foil which can then be developed in many different ways to yield either edge contrast or density images. Liquid ionography avoids the need for high pressure and allows multiple copies of the latent image to be made. There are some special applications of ionography in the research laboratory but in industrial work xeroradiography, despite lower sensitivity, is likely to be more convenient for any applications which demand edge contrast pictures.

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Electron Radiography: A New Method of Radiographie Imaging

Cited by 17 publications

References 0 publications

Edge contrast in ionography

Edge contrast in ionography

Electrostatic fields in an ionization chamber electret

Electrostatic imaging in radiology: limitations and prospects

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