Highlights
- •Temporal resolution (TR) of modern CT scanners was analysed using an impulse method.
- •Scan combinations of pitch factor (P) and gantry rotation time (R) were assessed.
- •For 320-row ADCT, TR ≈ R (with P < 1.0), whereas TR ≈ 0.5R (with P > 1.0).
- •For 128-slice DSCT, TR improved with a shorter R and greater P.
- •TR of helical acquisition modes were dependent on not only R but also P.
Abstract
Purpose
To analyse the temporal resolution (TR) of modern computed tomography (CT) scanners
using the impulse method, and assess the actual maximum TR at respective helical acquisition
modes.
Methods
To assess the actual TR of helical acquisition modes of a 128-slice dual source CT
(DSCT) scanner and a 320-row area detector CT (ADCT) scanner, we assessed the TRs
of various acquisition combinations of a pitch factor (P) and gantry rotation time (R).
Results
The TR of the helical acquisition modes for the 128-slice DSCT scanner continuously
improved with a shorter gantry rotation time and greater pitch factor. However, for
the 320-row ADCT scanner, the TR with a pitch factor of <1.0 was almost equal to the
gantry rotation time, whereas with pitch factor of >1.0, it was approximately one
half of the gantry rotation time. The maximum TR values of single- and dual-source
helical acquisition modes for the 128-slice DSCT scanner were 0.138 (R/P = 0.285/1.5) and 0.074 s (R/P = 0.285/3.2), and the maximum TR values of the 64 × 0.5- and 160 × 0.5-mm detector configurations of the helical acquisition modes for the 320-row ADCT
scanner were 0.120 (R/P = 0.275/1.375) and 0.195 s (R/P = 0.3/0.6), respectively.
Conclusion
Because the TR of a CT scanner is not accurately depicted in the specifications of
the individual scanner, appropriate acquisition conditions should be determined based
on the actual TR measurement.
Keywords
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Article info
Publication history
Published online: April 04, 2016
Accepted:
February 29,
2016
Received in revised form:
January 9,
2016
Received:
August 28,
2015
Identification
Copyright
© 2016 Associazione Italiana di Fisica Medica. Published by Elsevier Ltd. All rights reserved.
