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01.03.2012 | Interventional

Performing MR-guided biopsies in clinical routine: factors that influence accuracy and procedure time

verfasst von: Rüdiger Hoffmann, Christoph Thomas, Hansjörg Rempp, Diethard Schmidt, Philippe L. Pereira, Claus D. Claussen, Stephan Clasen

Erschienen in: European Radiology | Ausgabe 3/2012

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Abstract

Objective

To assess the accuracy, the duration and factors that influence the duration of MRI-guided liver or soft-tissue biopsies.

Methods

Nineteen liver biopsies and 19 soft-tissue biopsies performed using 1.5T-MRI guidance were retrospectively analysed. Diagnostic performance and complications were assessed. Intervention time was subdivided into preparation period, puncture period and control period. Correlation between procedure time and target size, skin-to-target-distance, used sequences and interventionalists’ experience were analysed.

Results

Overall sensitivity, specificity and accuracy were 0.86, 1.0 and 0.92, respectively. Two minor complications occurred. Overall median procedure time was 103.5 min. Liver biopsies lasted longer than soft-tissue biopsies (mean_{[soft-tissue]}: 73.0 min, mean_[liver]: 134.1 min, P < 0.001). The most time consuming part was the preparation period in both, soft-tissue and liver biopsies corresponding to 59.6% and 47.4% of the total intervention time, respectively. Total procedure time in liver biopsies (P = 0.027) and puncture period in liver and soft-tissue biopsies (P _[liver] = 0.048, P _{[soft-tissue]} = 0.005) was significantly prolonged for longer skin-to-target-distances. Lower numbers of image acquisitions (P _[liver] = 0.0007, P _{[soft-tissue]} = 0.0012) and interventionalists’ experience reduces the procedure duration significantly (P < 0.05), besides all false–negative results appeared during the first five biopsies of each individual radiologist.

Conclusion

The interventionalists’ experience, skin-to-target-distances and number of image acquisition influence the procedure time significantly.

Key Points

•Appropriate training and supervision is essential for inexperienced interventionalists.

•Two perpendicular image orientations should confirm the correct biopsy needle position.

•Communication between interventionalist and technician is essential for a fluent biopsy procedure.

•To shorten intervention time appropriate previous imaging is essential.

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Titel: Performing MR-guided biopsies in clinical routine: factors that influence accuracy and procedure time
verfasst von: Rüdiger Hoffmann
Christoph Thomas
Hansjörg Rempp
Diethard Schmidt
Philippe L. Pereira
Claus D. Claussen
Stephan Clasen
Publikationsdatum: 01.03.2012
Verlag: Springer-Verlag
Erschienen in: European Radiology / Ausgabe 3/2012
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-011-2297-x

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Performing MR-guided biopsies in clinical routine: factors that influence accuracy and procedure time