Siemens SOMATOM Sensation Cardiac Version A60 Operations Instructions download pdf (Page 522)

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Respiratory Gating

When imaging of the chest or abdomen is performed

by CT, there may be artifacts produced causing prob-

lems with reproducibility and resolution of images due

to patient respiration. Organs will move with each res-

piratory motion.

Especially in radiation therapy using a linear accelera-

tor for tumor treatment, normal tissues around a focus

might be unnecessarily exposed to radiation if the tar-

get located in a movable organ, because the field of

irradiation has to be set wider than the actual size of a

focus due to its organ's motion.

As far as the respiratory motion is periodical and repet-

itive, the organs in the chest or abdomen move period-

ically and repetitively according to respiratory motion.

Therefore the diagnostic artifacts and image degrada-

tion, and the treatment dangers can be avoided if pre-

cise detection of respiratory motion and its conse-

quent, synchronized imaging or irradiation is available.

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Siemens SOMATOM Sensation Cardiac Version A60 Operations Instructions Page 522

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