He was astonished and inspired but saw an opportunity to improve it. The Gamma Knife relied on a physical cage to coordinate the location of the subject's head and the device delivering the radiation; Adler wanted to use medical images to guide the beam, instead of the cage.
He was astonished and inspired by the Gamma Knife but saw an opportunity to enhance its functionality. Adler sought to replace the physical cage used to position the subject's head with medical images for directing the radiation beam.