For those late-night shoppers hoping these devices would be the miracle ride to lean and mean, Hirsh has this dose of reality: " If you take diet out of the picture, to lose one pound of fat, the average (160-pound person) would need one to nine months" (of working out regularly) on almost all of the devices they tested.

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The mean relative FEV1 across the combination dose groups returned toward baseline during the post-treatment 28-day washout period.

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"Many doctors expected that using a higher dose of radiation would mean better outcomes for patients, so this was a surprising result, " Swain said.

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If a patient needed a big dose of muscle relaxant, it can mean more time on a ventilator as those drugs wear off.

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Unfortunately, those four filters mean you also have to take four separate images to get one clear image, giving the patient quite the extra dose of radiation.

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