Bildgebende diagnostik solitärer lungenrundherde am offenen niederfeld-MRT - Ein vergleich zweler MR-sequenzen mit der spiral-CT

Translated title of the contribution: Imaging diagnosis of solitary pulmonary nodules on an open low-field MRI system - Comparison of two MR sequences with spiral CT

Jürgen F. Schäfer*, J. Vollmar, F. Schick, M. D. Seemann, F. Mehnert, R. Vonthein, H. Aebert, C. D. Claussen

*Corresponding author for this work
19 Citations (Scopus)

Abstract

Objective: To evaluate and compare two fast gradient-echo sequences (GRE) concerning the visualization of solitary pulmonary nodules with an open low-field MRI system in comparison to computed tomography. Materials and Methods: Fourteen patients with solitary pulmonary nodules detected by spiral CT ranging in size from 6 mm to 42 mm (mean 20 mm) underwent MRI on an open 0.2 T scanner using a spoiled 2D GRE (2D FLASH; TR/ TE/Flip = 100 ms/7.5 ms/30°) and a totally refocused 2D steady-state GRE (True-FISP; TR/TE/FA = 7.3 ms/3.5 ms/80°). The image quality concerning artifacts (by flow, breathing and susceptibility) and the morphologic characteristics of the nodules were scored and compared with CT by two independent radiologists. The diameters of the nodules measured by MRI were compared with CT measurements. The sequences were also evaluated with regard to the signal-to-noise ratio (SNR) of the lesion. Results: All lesions were detected with the 2D FLASH sequence. True-FISP failed to find a granuloma with a size of 6 mm. The 2D FLASH was rated significantly superior to true FISP concerning image quality artifacts by susceptibility as well as concerning to CT the presentation of nodule characteristics. In MR images, the size of lesions was significantly smaller than in CT images for both sequences: for 2D FLASH the mean difference was 0.9 mm and for true FISP 2.6 mm. The SNR of the nodules was significantly higher for the 2D FLASH than for the true FISP. Conclusion: In low field MRI, the 2D FLASH sequence is superior to the 2D true FISP sequence in imaging of pulmonary nodules. With the 2D FLASH sequence nodules of 6 mm or larger in size can be visualized.

Translated title of the contributionImaging diagnosis of solitary pulmonary nodules on an open low-field MRI system - Comparison of two MR sequences with spiral CT
Original languageGerman
JournalRoFo Fortschritte auf dem Gebiet der Rontgenstrahlen und der Bildgebenden Verfahren
Volume174
Issue number9
Pages (from-to)1107-1114
Number of pages8
ISSN1438-9029
DOIs
Publication statusPublished - 09.2002

Fingerprint

Dive into the research topics of 'Imaging diagnosis of solitary pulmonary nodules on an open low-field MRI system - Comparison of two MR sequences with spiral CT'. Together they form a unique fingerprint.

Cite this