"Two American radiologists independently of Bucky also came up with the idea of a moving grid. These were Eugene W Caldwell (1870-1918) 6, a radiologist and qualified engineer, who received a patent for an automated timing device to move the grid 4; and Hollis E Potter (1880-1964) 5, who was the first to present the development at a scientific event, namely the winter meeting of the Central Section of the American Roentgen Ray Society (ARRS) in February 1915 4."
"The working ability of a grid is described by the grid ratio, which is the ratio of the height of the lead strips (h) to the distance between two strips, i.e. the interspace (D) 7. A grid ratio of 5:1 is generally used for 20-40kVp (i.e. mammography), 8:1 is used for 70-90 kVp technique and 12:1 is used for >90 kVp technique. Higher grid ratios are more effective at reducing scatter, however are more expensive and require a higher dose."
"The strip line density (also known as grid frequency) (number of strips per cm) is 1/(D+d), where d is the thickness of the strip. This is typically 30-80 strips (or grid lines) per cm. Low frequency is 40 to 50 strips per cm, medium frequency is 50 to 60 strips per cm, and greater than 60 strips per cm is high frequency 7."
"The strip line density (also known as grid frequency) (number of strips per cm) is 1/(D+d), where d is the thickness of the strip. This is typically 30-80 strips (or grid lines) per cm. Low frequency is 40 to 50 strips per cm, medium frequency is 50 to 60 strips per cm, and greater than 60 strips per cm is high frequency 7."
"Primary transmission is the percentage of primary radiation transmitted through the grid. Ideally, a grid should have 100% primary beam transmission while blocking all the scatter radiation. The primary transmission can be calculated by measuring the ratio of intensity of radiation with a grid over the intensity of radiation without a grid as shown below 8:"
"The Bucky factor (also known as grid factor) 7,8 is the ratio of incident radiation falling the grid to the transmitted radiation. Although Bucky factor is similar to the primary transmission as described above; there is one major difference: Bucky factor measures both primary and secondary (scattered) radiation transmission, thus making it more practical to determine the additional amount of patient's exposure needed when switching from non-grid to grid technique in order to maintain the same image quality. The formula for Bucky/grid factor is 8:"
"The Bucky factor (also known as grid factor) 7,8 is the ratio of incident radiation falling the grid to the transmitted radiation. Although Bucky factor is similar to the primary transmission as described above; there is one major difference: Bucky factor measures both primary and secondary (scattered) radiation transmission, thus making it more practical to determine the additional amount of patient's exposure needed when switching from non-grid to grid technique in order to maintain the same image quality. The formula for Bucky/grid factor is 8:"
"The Bucky factor (also known as grid factor) 7,8 is the ratio of incident radiation falling the grid to the transmitted radiation. Although Bucky factor is similar to the primary transmission as described above; there is one major difference: Bucky factor measures both primary and secondary (scattered) radiation transmission, thus making it more practical to determine the additional amount of patient's exposure needed when switching from non-grid to grid technique in order to maintain the same image quality. The formula for Bucky/grid factor is 8:"
"The contrast improvement factor (K) is the ratio between the contrast with a grid and without a grid. The value of K typically range from 2 to 4 7. The formula is 8:"
"Grid selectivity index measures the ability of a grid to transmit primary radiation while filtering out the scattered radiation, as given by the formula below:"
"The Bucky factor (also known as grid factor) 7,8 is the ratio of incident radiation falling the grid to the transmitted radiation. Although Bucky factor is similar to the primary transmission as described above; there is one major difference: Bucky factor measures both primary and secondary (scattered) radiation transmission, thus making it more practical to determine the additional amount of patient's exposure needed when switching from non-grid to grid technique in order to maintain the same image quality. The formula for Bucky/grid factor is 8:"
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"The strip line density (also known as grid frequency) (number of strips per cm) is 1/(D+d), where d is the thickness of the strip. This is typically 30-80 strips (or grid lines) per cm. Low frequency is 40 to 50 strips per cm, medium frequency is 50 to 60 strips per cm, and greater than 60 strips per cm is high frequency 7."
"The Bucky factor (also known as grid factor) 7,8 is the ratio of incident radiation falling the grid to the transmitted radiation. Although Bucky factor is similar to the primary transmission as described above; there is one major difference: Bucky factor measures both primary and secondary (scattered) radiation transmission, thus making it more practical to determine the additional amount of patient's exposure needed when switching from non-grid to grid technique in order to maintain the same image quality. The formula for Bucky/grid factor is 8:"
"virtual grid: no actual grid is used; latest innovation for scatter reduction by digitally reconstructing a radiograph"
"moving grids (also known as Potter-Bucky or reciprocating grids): eliminates the fine grid lines that may appear on the image when focused or parallel grids are used; cannot be used for portable films"
"Two American radiologists independently of Bucky also came up with the idea of a moving grid. These were Eugene W Caldwell (1870-1918) 6, a radiologist and qualified engineer, who received a patent for an automated timing device to move the grid 4; and Hollis E Potter (1880-1964) 5, who was the first to present the development at a scientific event, namely the winter meeting of the Central Section of the American Roentgen Ray Society (ARRS) in February 1915 4."