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British Journal of Radiology (2005) 78, 836-840
© 2005 British Institute of Radiology
doi: 10.1259/bjr/29483804
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Quantitative analysis of lung and tumour mobility: comparison of two time-resolved MRI sequences

C Plathow, MD, MSc 1,2 M Klopp, MD 3 C Fink, MD 1 A Sandner, MD 4 H Hof, MD 5 M Puderbach, MD 1 F Herth, MD 6 A Schmähl, MD 7 and H-U Kauczor, MD 1

1 Department of Radiology, German Cancer Research Center, Heidelberg, Germany, 2 Department of Diagnostic Radiology, Eberhard Karls University, Tübingen, Germany, 3 Department of Thoracic Surgery, 4 Department of Oncology, 6 Department of Pneumology, 7 Department of Diagnostic Radiology, Clinic for Thoracic Disease, Heidelberg, Germany and 5 Department of Radiotherapy, University of Heidelberg, Heidelberg, Germany



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  		Figure 1. Continuous measurement of craniocaudal (CC) displacement of the thorax from deep inspiration to deep expiration using a trueFISP (3 images s–1, images above the time line) and a FLASH-sequence (10 images s–1, images below the time line) in a patient with a solitary stage I non-small cell lung cancer (NSCLC) within the left hemithorax. A significant decrease of the motion of the left hemithorax in comparison with the right side is demonstrated. Using the trueFISP sequence the tumourous areas exhibit a higher signal to noise ratio (SNR).

 


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  		Figure 2. (a) Craniocaudal (CC) displacement of the non-tumour bearing hemithorax from deep inspiration to deep expiration, comparison between trueFISP and FLASH sequence. (b) Complete breathing cycle from quiet tidal breathing followed by maximum inspiration and expiration using a trueFISP sequence. Non-tumour bearing hemithorax (–tumour) is compared with the tumour bearing hemithorax (+tumour).

 


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  		Figure 3. Maximum craniocaudal (CC) displacement of the non-tumour bearing hemithorax (–tumour), tumour bearing hemithorax (+tumour) and the tumour. Comparison between trueFISP and FLASH sequence (* p<0.01).

 




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