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Feasibility of Respiratory-gated High-pitch Spiral CT:: Free-breathing Inspiratory Image Quality.

Abstract：

RATIONALE AND OBJECTIVES:This study aimed to develop and implement a respiratory-gated setup for dual-source computed tomography (CT) at high pitch to examine patients in a reproducible inspiratory phase. MATERIALS AND METHODS:Twenty-one patients underwent free-breathing respiratory-gated chest CT using a high-pitch scan mode no more than 6 months after inspiratory breath-held nongated CT, which serves as reference. Scan parameters were as follows: pitch = 3.4, 128 × 0.6 mm collimation, 0.28 s gantry rotation time, and 150 ref.mAs per tube at 120 kV. The examinations were triggered using the tidal wave provided by a respiratory-gating system as input signal. Image quality was assessed focusing on artifacts and delineation of the anatomical and pathological structures. Lung volumes were measured on both free-breathing and reference examinations. RESULTS:All examinations were performed without complications. Image quality was high with both protocols. Significantly less motion artifacts were recorded with the high-pitch mode compared to the reference (P = 0.02). Most of the artifacts were located in the peripheral parts of the lower lobes for the study group and in the central part of the left lower lobe for the reference. Average total lung volume was 4.5 ± 1.5 L in respiratory-gated examinations and 5.8 ± 0.9 L in examinations with breath-hold in inspiration. CONCLUSIONS:High-pitch chest CT scanning during free breathing minimizes motion artifacts, improving image quality in patients with limited breath-holding abilities. To assure scanning in an inspiratory phase, data acquisition should be triggered with a respiratory-gating system.

journal_name

Acad Radiol

journal_title

Academic radiology

authors

Lell MM,Scharf M,Eller A,Wuest W,Allmendinger T,Fuchs F,Achenbach S,Uder M,May MS

doi

10.1016/j.acra.2015.12.018

subject

Has Abstract

pub_date

2016-04-01 00:00:00

pages

406-12

issue

4

eissn

1076-6332

issn

1878-4046

pii

S1076-6332(16)00022-2

journal_volume

23

pub_type

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