Radiation dose measurements to the eyes during cerebral angiography

Published on Jun 1, 1976in British Journal of Radiology3.039
· DOI :10.1259/0007-1285-49-582-570
C. Christine Smith1
Estimated H-index: 1
 , Haydn Williams6
Estimated H-index: 6
 , G. H. Du Boulay26
Estimated H-index: 26
Sources
Abstract
Recent interest in radiation dose to the cornea during neuroradiological investigations (Isherwood et al., 1975) prompted us to test our own figures during cerebral angiography. Thermoluminescent dosemeters (TLD) appropriately marked right and left were placed over the eyes of patients undergoing cerebral angiography. Our equipment consists of 24 × 30 cm Puck film-changers with Siemens Special Super High Speed screens and a Siemens Tridoros 5S generator.
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Radiation dose measurements suggest that patients undergoing extensive neuroradiological investigations may receive a corneal dose in excess of 60 rads in tissue over a relatively short period. — There is no direct evidence that lens damage occurs in man at this level but it is important that high dose levels should be appreciated and measures taken to reduce them. Protective spectacles have been devised to effect such a reduction in two high dose procedures, namely petrous tomography and cerebr...
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Abstract A review is presented of the value of special petrous views and tomography in 56 patients with acoustic neuromas. Ninety-two per cent of these patients showed abnormality of the petrous bones. Tomography was found to be only slightly more productive than special plain film views of the petrous pyramids in terms of positive diagnosis, and it gave rise to an increased incidence of false positives. For this reason, and to reduce unnecessary exposure, it is recommended that tomography of th...
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Abstract It was found that during “routine” petrous bone tomography a dose of 10 R was delivered to the cornea. Simple lead shields placed over the cornea reduced this dose to about 1.0 R. The shielding did not interfere with film quality and was easily accomplished. Tables give the doses to 20 organs and/or areas in Rando phantoms with and without the lead shield and in 10 critical organs in 6 patients with the shields in place.
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Cerebral angiography provides valuable information for use in the clinical management of patients but can result in relatively high radiation doses to patients and staff due to the extended fluoroscopy time and number of images acquired during an examination. In this study, extremity doses to radiologists and scrub nurses working in a neuroradiological centre were monitored during a 3 month period using thermoluminescent dosemeters (TLDs). Electronic personal dosemeters were also used to monitor...
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SUMMARY The use and benefits of a corneal shield specifically designed for use in cerebral angiography is discussed. It is shown that up to 70% reduction in dose may be achieved to the cornea on the ipsilateral side without loss of diagnostic information unless the suspected pathology lies within the eye, the orbit or the anterior fossa of the temporal lobe.
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Abstract The doses delivered to some critical organs of patients and staff during cerebral angiography, X-ray computer assisted tomographic scanning and 99Tcm brain scanning have been measured or assessed. The results show that doses received by staff and by the patients' gonads are generally quite low. However, patients having two or more of the investigations could receive skin and orbit doses in excess of 25 rad.
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Abstract An eye shield was developed for use in neurological examinations in projections in which it does not interfere with the information sought. Use of this shield in A.P., oblique, 30 deg Towne's and 12 deg carotid Towne's projections reduced the corneal dose to approximately 5% of the unshielded value. For lateral projections, doses were reduced to approximately 5–15%. Use of the shield resulted in corneal doses of the order of 0.5 mrad/mAs and 1.0 mrad/mAs for standard and magnified proje...
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1
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