A Study of Multimodal Image Registration and Fusion:Images of Lycoris aurea Herb. Bulbs
Date Issued
2010
Date
2010
Author(s)
Wu, Tung-Chang
Abstract
Lycoris aurea Herb., one of Taiwan’s major export flowers, is a flower bulb native to Taiwan. The invasive experiments usually used to understand the growth progress and properties of the bulbs. In this study, the images from the two non-invasive techniques, X-ray computed tomography (CT) and magnetic resonance imaging (MRI) had been integrated to develop an image registration and fusion algorithm, which is applied to observe the continuous changes of the same Lycoris aurea Herb. bulb. In MRI experiments, parameters such as repetition time (TR), echo time (TE) were adjusted by using a standard MSME (Multi-slice-multi-echo) spin-echo sequence in the 7T Bruker Biospec 70/30 to acquire high quality MR images with high contrast. On the other hand, the CT scanner was performed in GE eXplore Vista PET/CT, and parameters such as voltages, current, and shots of the X-ray source were adjusted to obtain the CT images with good tissue contrast of Lycoris aurea Herb. bulb. In image registration and fusion algorithm, CT images and MR images was regarded as reference image and test image, respectively. In image preprocessing, Hotelling transform was employed to realign the two images, and then rigid transformation was used to output the best parameters of transform function according to the matching index of area template. Finally, the two images were fused to the checkerboard rendered image. The matching index up to 87.4% and 36 images were fully matched in 41 block fusion images. For the morphological structure of Lycoris aurea Herb. bulbs, the difference between the flower and leaves buds were classified obviously in dormancy status in May. In addition, the flower buds grew quickly when the temperature decrease from 28℃ to 23℃. The moisture content change of interior Lycoris aurea Herb. bulb was evaluated by the T2 value and CT number. The results showed that both T2 value and CT number decreased during the drying process of Lycoris aurea Herb. bulb.
Subjects
image registration
image fusion
magnetic resonance imaging
computed tomography
plant morphology
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