All X-Ray Positions: A Complete Guide

Vocabulary flashcards covering patient positioning terms, beam angulations, standard anatomical views, and radiographic mechanics.

Anteroposterior (AP)

A radiographic projection where the central ray passes from the front (anterior) to the back (posterior) of the patient.

Posteroanterior (PA)

A radiographic projection where the central ray passes from the back (posterior) to the front (anterior) of the patient.

Oblique View

A patient positioning angled between an anteroposterior (AP) and lateral view.

Central Ray (CR)

The central or primary beam of X-rays directed toward the anatomical part and image receptor.

Image Receptor (IR)

The recording medium or device that intercepts the X-ray beam after it traverses the patient's body.

PA Chest View (Erect)

The gold-standard chest projection taken with the patient erect, facing the IR, chin raised, hands on hips, and shoulders brought forward.

Lateral Chest View

A chest projection positioned with the patient's left side against the IR and arms raised.

Abdominal Lateral Decubitus View

An abdominal projection performed with the patient lying on their side and the central ray directed horizontally to the mid-abdomen.

AP Caldwell View

A skull projection where the central ray is directed $15^\flat$ or $15^\times$—specifically $15^\flat$ caudad—$15^\flat$ caudad to the orbitomeatal line (OML).

PA Towne's View

A skull projection taken with the central ray angled $30^\flat$ caudad to the orbitomeatal line (OML).

Submento-Vertex (SMV) View

A skull projection where the central ray is directed perpendicular ($\perp$) to the orbitomeatal line (OML).

Cervical Spine AP View

An anterior projection of the cervical vertebrae performed with the midsagittal plane (MSP) centered and no rotation.

Scapular Y View

A shoulder projection performed with the patient's arm positioned across the chest and the central ray angled $25^\flat$ caudad.

Axillary View

A specialized projection of the shoulder girdle where the central ray passes directly through the axilla.

Elbow AP / Lateral

An elbow examination requiring the joint to be flexed at $90^\flat$ for the lateral projection.

AP Pelvis View

A pelvic examination performed with the patient supine and both legs internally rotated $15^\flat$.

Frog Leg Lateral View

A lateral projection of the pelvis and hip performed with the hip and knee flexed and abducted.

Chest Lordotic View

A specialized chest projection performed with the central ray angled $15^\flat$ cephalad.

Chest Apical Lordotic View

A specialized projection of the chest apices utilizing a central ray angled $30^\flat - 40^\flat$ cephalad.

Water's View (Nasal Bones)

A facial/nasal bone projection taken with the central ray angled $15^\flat$ caudad.

Mandible PA View

A projection of the mandible performed with the mouth open and the central ray directed $15^\flat$ cephalad.

Dento-Alveolar Projection

A dental radiographic projection performed utilizing the long cone technique.

Radiographic Density Hierarchy

The progression of tissue radiopacity from darkest (black) to lightest (white): $\text{Air} < \text{Fat} < \text{Water} < \text{Bone} < \text{Metal}$.

Radiographic Exposure Scale

The relationship between exposure and image tone: less exposure results in a light (underexposed) image, optimum exposure produces an adequate gray scale, and excess exposure results in a dark (overexposed) image.