Transcript Lecture (3)
Lecture (3) • Erect Positions Surface of body closest to the film used to give a more specific description Examples: Posterior erect -- patient is standing with the posterior surface of the body next to the cassette Left lateral erect -- patient is standing with the left side of the body next to the cassette • Recumbent Positions Supine : (posterior recumbent position) – Lying down on the back Prone (anterior recumbent position) Lying face down • Right lateral recumbent side lying down on the right • Oblique (Erect or Recumbent) • Position when the body is rotated so that the medial sagittal plane (MSP) is neither nor to the film but at an angle • Exact position is indicated by the surface closest to the film and the angle of rotation May be erect or recumbent • Abbreviations: (RPO,LPO, RAO, LAO) 45 degrees RPO Decubitus Positions • Ventral decubitus : patient is prone & a horizontal beam is used Dorsal decubitus : patient is supine & a horizontal beam is used • Left lateral decubitus : • patient lying on the left lateral side & a horizontal beam is used PROJECTION • Refers to the path the beam takes through part Anteroposterior projection (AP) Beam enters the front surface and exits the back surface of the part AP projection in supine position Posteroanterior projection (PA) Beam enters the back and exits the front of the part PA projection in prone position Special Projections (Position) • Axial • projection that includes an angulation of the beam usually to the long axis of the body part. Tangential projection obtained when the central ray touches only along the edge of a curved body part AP axial with 40° caudal angle