Comparison of image quality in optical and radiographic magnification techniques for fine-detail skeletal radiography: effect of object thickness Page: 3 of 38
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
High-resolution radiography for the detection of subtle changes
in the peripheral skeleton may be performed by two different magnifi-
cation techniques. One may be called optical magnification, in which
fine-grain film is used without screens and the image is viewed with
4-10x optical magnification by means of a hand lens; projector, or
microscope (1-6). The other may be called radiographic magnification,
in which a screen-film system and 4x geometric magnification are
employed in conjunction with a grid-biased microfocus x-ray tube. The
optical magnification technique has een applied to over 2,000 patient
examinations in our department, and its clinical usefulness has been
well demonstrated (4-6). In addition, the effect of physical param-
eters on image quality tith this technique has been studied in detail,
and it has been shown that the present optical magnification technique
is almost optimal for radiography of the peripheral skeleton (7). On
the other hand, clinical experience with the radiographic magnification
technique is rather limited at present, and the physical parameters
have not been optimized. It has been suggested; however, that radio-
graphic magnification may overcome some of the limitations of optical
magnification (8,9), including the high radiation dose to the patient
and the special viewing procedure required.
A comprehensive analysis comparing these two techniques for
skeletal imaging has not been undertaken previously, except in pre-
liminary form (8). The ain in this study is to compare the imaging
performance and clinical results for the two techniques. The physical
irage quality .is evaluated by H 6 D curves, 1=TFs, and Wiener spectra.
Here’s what’s next.
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Doi, K.; Genant, H.K. & Rossmann, K. Comparison of image quality in optical and radiographic magnification techniques for fine-detail skeletal radiography: effect of object thickness, article, January 1, 1974; United States. (https://digital.library.unt.edu/ark:/67531/metadc1021083/m1/3/: accessed April 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.