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| The prostate grid has holes spaced evenly 5mm apartThe needles are inserted into the appropriate grid hole and watched under ultrasound to ensure that they hit the gland at the same grid point. | If the needle is off or crooked, it can be repositioned before the seeds
are inserted through the needle. At the time of the implant a spring loaded gun is used to push the seeds into the needles once they are in proper position |