Image denoising using Wavelets: A powerful tool to overcome some limitations in nuclear imaging

In spite of their bad resolution, scintigraphic images are used as an indicator of the functionality of some organs. The drawbacks of this image modality are the bad contrast and resolution of images and the fluctuations due to the Poisson distribution. Instead of increasing the injected dose or increasing the duration exposure of the patient, we propose a method base on image processing to enhance the image quality and decrease fluctuations. The proposed method is based on the adaptive thresholding of the wavelet coefficients combined with the Fisz transform in low count level. Results are considered, by nuclear medicine specialists, interesting with respect to the image quality enhancement while contours and details preservation