Phi Angle Lap Band. On AP abdominal radiograph films a correctly positioned gastric band has a ф (phi) angle of 4° to 58° between the profile of the gastric band and the vertical axis of the spine As seen in the films from this case the patient’s gastric band is in an abnormal nearhorizontal position with a ф (phi) angle of close to 80° indicative of band slippage.
The phi angles of the bands varied in a comparable range PO day 1 (degrees) 62 ± 13 and 59 ± 15 PO week 6 55 ± 9 and 54 ± 11 for SIL and conventional respectively.
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Why is there an angle phi added to the function acos(ωT)? Answers and Replies Oct 10 2012 #2 rudolfstr 17 0 it’s Acos(ωT+ϕ) omega stands for how fast it’ s oscilating but phi determines the initial position( wold be Acosϕ) Oct 10 2012 #3 Shan K 73 0202012022020120220151204.
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In an anteroposterior (AP) projection the band is inclined 45° to the patient left (phi angle corresponding to the angle between the spinal column and the gastric band has a normal range between 458°) and lies about 5 cm below the diaphragm (Figs 2A and 2B) After adequate filling with contrast or solid meal the gastric pouch diameter is normally about 4 cm which.
What is normal Phi angle gastric band?
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Drawing (a) and AP radiograph (b) show how the φ (phi) angle is measured to determine whether a gastric band is correctly positioned The φ angle is the angle formed by the profile of the gastric band (arrow in b) and the vertical axis of the spine on frontal views If the band is correctly positioned the φ angle will be between 4° and 58°.