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A chest radiograph, chest X-ray (CXR), or chest film is a projection radiograph of the chest used to diagnose conditions affecting the chest, its contents, and nearby structures. Chest radiographs are the most common film taken in medicine.
State of the art modern CT scanners with a scan rate of up to 320 mm/s can acquire all the images within a 1-second X-ray exposure, avoiding the problems of respiratory motion, cardiac motion and contrast draining from the pulmonary circulation during the study. Even though the actual scan may be completed in 1 second or less, considerable ...
Natural color X-ray photogram of a wine scene. Note the edges of hollow cylinders as compared to the solid candle. William Coolidge explains medical imaging and X-rays.. An X-ray (also known in many languages as Röntgen radiation) is a form of high-energy electromagnetic radiation with a wavelength shorter than those of ultraviolet rays and longer than those of gamma rays.
Although a nonspecialist dictionary might define radiography quite narrowly as "taking X-ray images", this has long been only part of the work of "X-ray departments", radiographers, and radiologists. Initially, radiographs were known as roentgenograms, [ 8 ] while skiagrapher (from the Ancient Greek words for "shadow" and "writer") was used ...
Diagnosis of a lung cavity is made with a chest X-ray or CT scan of the chest, [2] which helps to exclude mimics like lung cysts, emphysema, bullae, and cystic bronchiectasis. [5] Once an imaging diagnosis has been made, a person’s symptoms can be used to further narrow the differential diagnosis.
It takes an average of six hours for the characteristic white regions to show up on a chest X-ray, and the contusion may not become apparent for 48 hours. [7] [27] [43] When a pulmonary contusion is apparent in an X-ray, it suggests that the trauma to the chest was severe and that a CT scan might reveal other injuries that were missed with X ...
[1] [9] As the lung contusion clears (usually within two to four days), lacerations begin to become visible on chest X-ray. [3] CT scanning is more sensitive and better at detecting pulmonary laceration than X-rays are, [1] [5] [12] [15] and often reveals multiple lacerations in cases where chest X-ray showed only a contusion. [12]
Low-dose high-resolution (1.25 mm) chest CT. HRCT is performed using a conventional CT scanner. However, imaging parameters are chosen so as to maximize spatial resolution: [1] a narrow slice width is used (usually 1–2 mm), a high spatial resolution image reconstruction algorithm is used, field of view is minimized, so as to minimize the size of each pixel, and other scan factors (e.g. focal ...