Teleradiology is the electronic transmission of radiological patient images, such as x-rays, CTs, and MRIs, from one location to another for the purposes of interpretation and/or consultation. Teleradiology improves patient care by allowing Radiologists to provide services without actually having to be at the location of the patient. This is particularly key when a sub specialist such as a neurology radiologist or pediatric radiologist is needed as these professionals are generally only located in large metropolitan areas working during day time hours. Teleradiology network is performed using standard network technologies such as the internet, telephone lines, wide area network (WAN), or over a local area network (LAN). Highly specialized software is used to transmit the images and enable the radiologist to effectively analyze what can be 100's of images for a given study. Technologies such as advanced graphics processing, voice recognition, and image compression are often used in teleradiology. Through teleradiology, images can be sent to another part of the hospital, or to other locations around the world. Teleradiologists can provide a preliminary read for emergency room purposes or a final read for the official patient record and for use in billing.