The book "Compression of DICOM-CT Images Applying ROI and WT Encoding" by E. Gladys Cutipa Arapa offers a comprehensive analysis of the challenges and solutions in the field of storing and transmitting medical image data. Given the enormous amounts of data generated by imaging techniques per patient, efficient compression is crucial. The author presents an innovative approach to image compression that utilizes the encoding of regions of interest (ROI) in combination with wavelet transformation (WT). This method aims to maximize the quality of the compressed images while minimizing the required storage resources. The book is aimed at professionals and students in the fields of engineering and IT who wish to engage with digital image processing and its associated challenges. It provides valuable insights into modern compression techniques and their application in the DICOM format, which is of great importance for the long-term storage and efficient transmission of medical images.