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AJNR - American Journal of Neuroradiology

Published ahead of print on November 1, 2007
doi: 10.3174/ajnr.A0800

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Thrombus Volume Comparison between Patients with and without Hyperattenuated Artery Sign on CT

E.Y. Kim^a, E. Yoo^a, H.Y. Choi^b, J.W. Lee^a and J.H. Heo^b

^a Department of Radiology, Research Institute of Radiologic Science, Yonsei University College of Medicine, Seoul, Korea
^b Department of Neurology, National Core Research Center for Nanomedical Technology, Yonsei University College of Medicine, Seoul, Korea

View larger version (54K): [in this window] [in a new window]   Fig 1. A representative case showing the procedure of thrombus volume measurement. A, Maximum intensity projection images of thin-section noncontrast CT in a patient with occlusion in both M1 and M2 segments on the right (arrows). B, All pixels are segmented with a threshold of 50–100 HU to select the thrombus (azure areas). After selecting the function of 3D region growing, we drew a region of interest around the thrombus on an axial image and then automatically segmented the whole thrombus (indigo areas). Note that the thrombus does not approximate the border of the probable thrombus. C, Pixel dilation with a single iteration for the segmented thrombus is performed at a threshold of 40–100 HU. The thrombus approximates its border more than does the thrombus on B (indigo areas). D, The volume and mean Hounsfield unit of the thrombus are calculated. MinValue indicates minimal value; MeanValue, mean value; MaxValue, maximal value.

View larger version (15K): [in this window] [in a new window]   Fig 2. Thrombus volume comparison according to the presence or absence of hyperdense artery sign.