Rofo 2016; 188(09): 859-863
DOI: 10.1055/s-0042-109071
Technical Innovations
© Georg Thieme Verlag KG Stuttgart · New York

Dynamic 3D MR-Defecography

Dynamische 3D-MR-Defäkografie
V. Ratz
,
T. Wech
,
A. Schindele
,
A. Dierks
,
A. Sauer
,
J. Reibetanz
,
A. Borzi
,
T. Bley
,
H. Köstler
Further Information

Publication History

11 March 2016

18 May 2016

Publication Date:
26 July 2016 (online)

Abstract

Epidemiological studies have estimated the incidence of chronic constipation to be up to 27 % of the general population. The gold standard to evaluate affected patients is the dynamic entero-colpo-cysto-defecography. In the clinical routine 2 D MR-defecography is also performed, but only one to three 2 D slices at a temporal footprint of about one second are acquired. To improve the detection of lateral localized pathologies, we developed and implemented dynamic 3 D MR-defecography. Each 3 D block consisted of seven slices with an in-plane spatial resolution of 1.3 × 1.3mm² to 2.3 × 2.3mm² and an image update rate between 0.8 s and 1.3 s. We used a fast bSSFP sequence with a modified stack-of-stars sampling scheme for data acquisition and a modified FISTA compressed sensing algorithm to reconstruct the undersampled datasets. We performed a study including 6 patients to optimize the acquisition parameters with respect to image quality.