CT Densitometry as a Predictor of Pulmonary Function in Lung Cancer Patients
Fiachra Moloney*, 1, Sebastian McWilliams1, Lee Crush1, Patrick D Mc Laughlin1, Marcus Kenneddy2, Michael Henry2, OJ O’ Connor1, Michael M Maher1
1 Department of Radiology, Cork University Hospital and University College Cork, Cork, Ireland
2 Department of Respiratory Medicine, Cork University Hospital, Cork, Ireland
Preoperative pulmonary assessment is undertaken in patients with resectable lung cancer to identify
those at increased risk of perioperative complications. Guidelines from the American College of Chest Physicians indicate
that if the FEV1 and DLCO are ≥60% of predicted, patients are suitable for resection without further evaluation.
The aim of our study is to determine if quantitative measures of lung volume and density obtained from pre-operative CT
scans correlate with pulmonary function tests. This may allow us to predict pulmonary function in patients with lung
cancer and identify patients who would tolerate surgical resection.
Materials and Methods:
Patients were identified retrospectively from the lung cancer database of a tertiary hospital. Image
segmentation software was utilized to estimate total lung volume, normal lung volume (values -500 HU to -910 HU),
emphysematous volume (values less than -910 HU), and mean lung density from pre-operative CT studies for each patient
and these values were compared to contemporaneous pulmonary function tests.
A total of 77 patients were enrolled. FEV1 was found to correlate significantly with the mean lung density
(r=.762, p<.001) and the volume of emphysema (r= -.678, p<.001). DLCO correlated significantly with the mean lung
density (r =.648, p<.001) and the volume of emphysematous lung (r= -.535, p<.001).
The results of this study suggest that both FEV1 and DLCO correlate significantly with volume of
emphysema and mean lung density. We now plan to prospectively compare these CT parameters with measures of good
and poor outcome postoperatively to identify CT measures that may predict surgical outcome preoperatively
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* Address correspondence to this author at the Department of Radiology, Cork University Hospital, Wilton, Cork, Ireland; Tel: 00353861938625; Fax: +00 353 21 4922857; E-mail: firstname.lastname@example.org