Supervoltage beam films

Hammoudah, Mahmoud M.; Henschke, Ulrich K.

doi:10.1016/0360-3016(77)90170-5

Cited by 22 publications

(5 citation statements)

References 3 publications

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“…We have investigated the feasibility of using digital electronic image enhancement techniques in the localisation and verification of high energy x-ray beams in radiation therapy. The importance of localisation and verification procedures is well known and much effort has been expended to improve them (Marks et a1 1974(Marks et a1 , 1976: Kartha et al Trussell er al Marks and Haus 1976;Hammoudah and Henschke 1977;Byhandt et a1 1978;Hanson 1982). Unfortunately, the lack of contrast in high energy x-ray portal images has rendered them less than optimal.…”

Section: Introductionmentioning

confidence: 99%

A digital image processing system for high energy x-ray portal images

Leong¹

1984

Phys. Med. Biol.

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Section: Introductionmentioning

confidence: 99%

A digital image processing system for high energy x-ray portal images

Leong¹

1984

Phys. Med. Biol.

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“…Introduction of metal screens into the film cassette [31][32][33] meant that some medical X-ray films could be used. The composition of the metal screens has been shown to affect the image quality [33][34][35], as has the film used in these cassettes [28,[36][37][38].…”

Section: Imaging Mediamentioning

confidence: 99%

Portal imaging

Langmack¹

2001

BJR

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Portal imaging is the acquisition of images with a radiotherapy beam. Imaging theory suggests that the quality of portal images could be much higher if the efficiency of the imaging media in detecting radiation could be improved. Introduction of new media (films and electronic portal imaging devices) has confirmed this by markedly increasing the quality of portal images. Images from these devices can then be used to verify a patient's treatment. Geometric verification requires the portal image to be registered with a reference image. Dosimetric verification requires the portal imager to be calibrated for dose. This review gives a brief overview of the current areas of interest in portal imaging: imaging theory; imaging media, film and electronic portal imaging devices; image registration; and dosimetry using these devices.

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“…The first exposure encompasses only the actual treatment field while the second exposure is made with an enlarged field with all beam shaping blocks removed, thus making it easier to recognize anatomical landmarks. Because the quality of high energy port films is markedly less than that of diagnostic or simulation films, there has been a steady effort to improve the imaging characteristics of port films (Droege, 1977;Galkin & Wu, 1978;Hammoudah & Henschke, 1977, Reinstein & Orton, 1979and Strubler, Galkin & Suntharalingam, 1977). Although portal films render poorer quality images compared to other radiographs, they are considered to contain sufficient information for determining accuracy of beam placement (Stanton & Stinson, 1992).…”

Section: Verification Of Geometric Accuracymentioning

confidence: 99%