Ασπίδα προστασίας θυρεοειδούς

Εκτύπωση

The GrayShield Thyroid Protection Shields are the result of an extensive development to produce the most technically and cost effective shielding for patients undergoing CT or X-ray procedures.

FEATURES:

The Thyroid Protectors are shaped to fit comfortably over the Adam’s Apple and are designed to provide a significant dose reduction to the radiosensitive thyroid gland.

The shields have a Lead Equivalency (LE) of 0.125 mm. The dose reduction through the shield has been independently tested and verified in clinical studies, showing a practical dose reduction in excess of 60% during CT or general X-ray examinations and 80% dose reduction in independent transmission testing throughout the range of 50kV to 150 kV.

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1ST COMMENT FROM THE MANUFACTURER

The new Barium material is designed for use at present to protect the eyes, thyroid and genital areas of the patient whilst undergoing a CT scan without interferring with the  images.
 
Lead equivalence between 0.07/8 and 0.25mm LE. It is thought that the material at the low end (0.07mm LE) can be used to attenuate the x-ray by approximately 50% and still provide a decent resolution. That is, not fog the images obtained from a CT scanner. However,there also has to be a case for using the same disposable material being used to protect a patient's organs that are not in the direct line of the scan, but will inevitably receive a high dose of scatter radiation. For this, one could use multiple layers of the same material, or we can provide a range of thicknesses providing a protection of between 0.1mm and 0.25mm LE.
 
You may also like to note that the material is made from Barium and a standard vinyl composition. This has an advantage over the Bismuth/Latex samples available, as many people are allergic to Latex. Furthermore, Barium is completely safe, can be disposed of through normal waste and is well known to radiologists - as they already have patients ingest it to perform traces by way of x-ray's etc.

2ND FROM THE MANUFACTURER

The eye shield is actually the 'one layer' material and is 0.075mm LE.  The Thyroid Shield is actually the 'two layer' material and is actually 0.125mm LE.  You may think this low but there is a technical reason for this.  The Eye Shield is designed to protect ONLY the lens of the eye during a CT scan.  Any radiation shielding put in the way of a head scan will create artefacts in the image if it is of too high in terms of Lead equivalence, or in direct contact with the patient.  Therefore the Lead equivalency of 0.075mm and the foam stand-off used in the Eye Shield is the optimum amount of protection you can give to the lens of the eye, without creating artefacts in the image.
 
The Thyroid Shield serves a different purpose.  It should be used to protect the Thyroid from scatter radiation during, say, a head scan, chest/heart scan etc.  But only used when the thyroid is not required in the image.  It is used to protect the Thyroid from scatter radiation - when the Thyroid is not required in the image.  The 0.125mm LE is again the optimal protection level/attenuation because of the way the scan is carried out.  If we increase the protection of the Thyroid Shield to, say, 0.25mm LE, it has virtually no effect on the attenuation due to the amount of gamma radiation generated internally and from various angles (from the back for example) employed by the CT scanner during operation.