And finally, don’t forget to protect the anesthesiologist! A standing shield that gives broad coverage area should suffice, Dr. Farber said.
Vary the technique
Altering the angle can help ensure that one area of the patient’s body isn’t being overexposed to radiation. Since previously irradiated skin reacts abnormally when re-exposed to radiation because the regeneration and repair of the dermis can take up to several weeks after the initial insult, the timing of the intervals between exposures is critical, said Dr. Kirkwood, adding that the Joint Commission recently recommended that all doses of fluoroscopically guided interventions performed within the past 6-12 months should be considered when assessing potential skin injury risk.
Change the collimation
Making it tighter, for example, can help improve image quality and reduce the radiation dose to both the patient and the operator, as can varying the acquisition rates.
Exit the room during DSA
During digital subtraction angiography, Dr. Farber said to “get away from the table if you can! It’s a huge dose you don’t need to be exposed to if you don’t need to be right next to the machine.” Dr. Kirkwood agreed: “Angiography is 10-100 times more dose than fluoroscopy.”
De-mag
Using a larger monitor allows the operator to see more detail without increasing the magnification, which also increases the dose in the amount of the diameter over the diameter squared. “By not magnifying up [from a field of view of 14 to 28] you will save yourself a factor of at least 4,” Dr. Farber said. “And the actual dose may be even less.”
Optimize imaging
Today’s advanced imaging systems mean that it’s easy to produce many high-quality images – CT scans and ultrasounds – that allow a deeper, more complete picture.
Having the number of images it is now possible to have on screen at once is “practice changing” because it can help clinicians see more possibilities for “how to do the case,” said Dr. Farber. “I’ve never heard anyone say, ’Well, I wish I didn’t have that extra imaging next to me.’ ”
Save images
But once you get it, don’t forget to keep it. “Many times you do an acquisition, you move the machine, and you realize you forget to save the image and now you’ve got to go back and do it all over again,” Dr. Farber lamented. But by once again making technology your friend, with functions that allow auto-return to previous positions, among other auto-commands, you can save the needed information and reduce any unnecessary dose exposure for both yourself and the patient, he said.
Protect your eyes
Cataracts are still all too common in the field, according to Dr. Farber. “It’s important that you have side shields on your glasses to cut down on the amount of radiation that comes in and around the glasses.” Eschew glasses that don’t overtly hug your face, he said.
Know your geometry
Don’t forget that, if you’re standing on the side of the imaging source, the scattering effect will be greater than if you’re on the side of the image receptor. Once again, an understanding of the inverse square law can be protective, according to Dr. Kirkwood: “As x-rays exit the source, there is an exponential decrease in the number of x-rays per unit area as the distance from the source increases.”
“It’s simple stuff,” concluded Dr. Farber. “If you get in the habit of doing these things you will cut down your radiation exposure.”
Neither Dr. Farber nor Dr. Kirkwood had any relevant disclosures.
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