In traditional angiography, we acquire images of blood vessels on films by exposing the area of interst with time-controlled x-ray energy while injecting contrast medium into the blood vessels. The images thus obtained would also record other structure besides blood vessels as the x-ray beam passes through the body. In order to remove these distracting structures to see the vessels better, we need to acquire a mask images for subtraction. The mask image is simply an image of the same area without contrast administration. So, using manual darkroom technique, clear pictures of blood vessels are obtained by taking away the overlying background. In DSA, the images are acquired in digital format through the computer. With the help of the computer, all images would be recorded into the computer and subtracted automatically. As a result, we can have a near-instanteous film show of the blood vessels alone after x-ray.

Digital fluoroscopy can reduce the radiation dose through improvements in image quality and machine features. Better image quality and the ability to manipulate contrast and brightness reduce the number of images that must be obtained to complete a procedure. They also shorten procedure times and enhance patient throughput. Also valuable are the dose-reduction features being incorporated by manufacturers of digital fluoroscopy systems. Some of these features are quite basic, such as filters that prevent delivery of much of the "soft" (and not useful) radiation. Other features are more elaborate. One example is anatomic programming, with which the machine parameters can be set automatically to obtain images of the minimal quality necessary for a given region of the body, reducing the likelihood of inappropriate setting choice by the operator. Also available is software that monitors the intensity of the radiation striking the detector and within milliseconds adjusts the x-ray tube output and exposure time to optimize the image quality and minimize the radiation dose. With digital (recursive) filtering, part of an image is constructed from previous images, such that less radiation is needed to acquire the live image. Frame grabbing avoids the need for many spot films. Another useful feature is the real-time display of cumulative dosage information, so the operator is constantly made aware of how much radiation the patient has received. Some of these systems are capable of outputting the total radiation dose with the images into the patient's medical record.

Mammography is a specific type of imaging that uses a low-dose x-ray system for the examination of breasts. A mammography exam, called a mammogram, is used as a screening tool to detect early breast cancer in women experiencing no symptoms and to detect and diagnose breast disease in women experiencing symptoms such as a lump, pain or nipple discharge. Mammography plays a central part in early detection of breast cancers because it can show changes in the breast up to two years before a patient or physician can feel them. Digital mammography uses less radiation than film mammography. Digital mammography allows improvement in image storage and transmission because images can be stored and sent electronically. Many studies show that a digital mammogram is more accurate in finding breast cancer than a film mammogram for women who are younger than 50, have dense breasts, or who still have their periods.

DR(Digital Radiography) can simply provide better images while reducing patient exposure to radiation. Moreover, DR images can be digitally enhanced and manipulated by sophisticated software to extract considerably more information facilitating earlier detection, more accurate diagnoses and more effective treatment. Digital images also can easily be stored and retrieved almost instantly, enhancing clinicians' ability to review images or refer them to consulting physicians.

Upright Computed Radiography offers greater versatility and ease of use, with a large detector-unit vertical movement. Lower extremity and seated examinations are as easy as standard chest X-rays. A mere two seconds after initial exposure, each digital image begins to display, attaining its consistently high final quality only seven seconds later. It can provide up to 240 high-quality images per hour.