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First published online December 6, 2006
British Journal of Radiology (2007) 80, 355-361
© 2007 British Institute of Radiology
doi: 10.1259/bjr/31008031
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Interbreath-hold reproducibility of lung tumour position and reduction of the internal target volume using a voluntary breath-hold method with spirometer during stereotactic radiotherapy for lung tumours

T Kimura, MD, PhD 1,2 Y Murakami, MD 1 M Kenjo, MD 1 Y Kaneyasu, MD, PhD 1 K Wadasaki, MD, PhD 1 K Ito, MD, PhD 1 and M Ohkawa, MD, PhD 2

1 Department of Radiology, Hiroshima University Graduate School of Medicine, Hiroshima, 2 Department of Radiology, Kagawa University School of Medicine Kagawa, Japan


Figure 1
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  		Figure 1. A volunteer patient breathed through a mouthpiece connected to the gas monitoring sensor. A nose clip was used to prevent nasal breathing and ensure that the patient breathed through the mouthpiece. For patient set-up, we used a vacuum cushion (Vac-Lok, MEDTEC, Orange City, IA).

 

Figure 2
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  		Figure 2. The workstation ran a custom application, developed using virtual instrument software(LabVIEW, National Instruments, Austin, TX) that integrated the spirometry signal, yielded the respiratory tidal volume of the patient and was able to display a flow-time curve which can show the state of inspiration, expiration and breath-hold.

 

Figure 3
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  		Figure 3. All gross tumour volumes were delineated by a physician on each axial image in a three-dimensional (3D) treatment planning system. The CT window and level was 1600 Hounsfield Units (HU) and –300 HU during each contouring session.

 

Figure 4
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  		Figure 4. The scatter-plots of the gross target volume centroids in the craniocaudal (CC) vs left–right (LR) directions.

 

Figure 5
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  		Figure 5. The scatter-plots of the gross target volume centroids in the anteroposterior (AP) vs left–right (LR) directions.

 




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