[A trial to reduce cardiac motion artifacts on HR-CT images of lung with combined use of subsecond scan and a high temporal resolution reconstruction algorithm].

PURPOSE

To reduce cardiac motion artifacts with combined use of subsecond CT scanning and a high temporal resolution algorithm.

SUBJECTS AND METHODS

Scan data were obtained with step-by-step scanning (scan time, 0.8 seconds). Two sets of images were reconstructed, with and without high temporal resolution reconstruction algorithm (HTRR), from the same set of scan data. HTRR, derived from modification of 180-degree linear helical interpolation, reduces full width at half maximum (FWHM) to half of the scan time. Motion artifacts of two sets of images were compared.

RESULTS

The use of HTRR seemed to be useful in reducing cardiac motion artifacts owing to the improvement of effective time resolution. However, there were some images without significant reduction of cardiac motion artifacts.

CONCLUSION

Our technique is useful in reducing cardiac motion artifacts without an increase in radiation exposure.