Siemens SOMATOM Sensation Cardiac Version A60 Operations Instructions download pdf (Page 528)

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Respiratory Gating

Scanning Information

The expected benefits in radiation treatment planning,

e.g. for lung and abdominal tumors are:

• Information about tumor motion in 3D coordinates

and over time

• More accurate tumor shape delineation and there-

fore a more precise RTP (radiation therapy planning)

• Potential for sparing of healthy tissue, minimization

of PTV (planned target volume) and less side effects

• Potential for dose acceleration and higher cure rate

To minimize motion artifacts, two requirements are

mandatory for a CT system:

– Fast gantry rotation to raise the temporal resolution

for artifact free images

– Prospective Triggering of image acquisition in a

sequential mode or Retrospective Gating of image

reconstruction in a spiral mode based on the record-

ing of the respiratory curve in order to obtain images

during inspiration and expiration phases.

Scan Parameters

A respiratory-gated lung spiral with cone correction

will be provided. To be able to work also with low

breathing rates, a fixed pitch factor of a min. of 0.1 is

needed. Slice widths and collimation are the same as

for cardio spiral.

In the Specials folder different scan protocols are pre-

defined for different breathing rates.

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Siemens SOMATOM Sensation Cardiac Version A60 Operations Instructions Page 528

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