Projectional radiography
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Projectional radiography or plain film radiography is the practise of producing 2D X-ray images. Typically most body parts being x-rayed, have two 'projections' taken, usually at right angles to each other. This is for two reasons. First that many fractures are only visible in one plane, which exact plane is unknown to the radiographer until the images is taken. Secondly to assess alignment of fractures and spatial position of foreign bodies. Gathering as much information as possible is very important as it can mean the difference between a POP cast and surgery. Mammography and dental radiography also come under the category of projectional radiography, but these topics are too complex to include in this article. See Mammography and Dental radiography for the full article.
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Clinical applications of projectional radiography
Projectional radiography is typically used to detect:
Boney anomalies
- Fractures
- Dislocations
- Arthritis
- Benign and Malignant Tumours
- Scoliosis
- Other Bone Conditions i.e.Scleroderma and Osteomyelitis
Soft tissue anomalies
- Chest Pathology
- Actue Bowel Obstruction
- Bowel Perforations
- Foreign body
Divisions of the skeleton
The human skeleton is divided into two categories:
Axial skeleton
- Skull and Facial Bones
- Chest
- Cervical Spine
- Thoracic spine
- Lumbar spine
- Sacrum and Coccyx
- Abdomen
Appendicular skeleton
- Shoulder Girdle
- Humerus
- Elbow
- Radius and Ulna
- Wrist
- Hand
- Fingers / Thumb
- Pelvic girdle
- Femur
- Knee
- Tibia and Fibula
- Ankle
- Calcaneum
- Foot / Toes
Projectional radiography terminology
- AP - Antero-Posterior
- PA - Postero-Anterior
- Lateral - Projection taken with the central ray perpendicular to the midsaggital plane
- Oblique - Projection taken with the central ray at an angle to any of the body planes
- Flexion - Joint is radiographed while in flexion
- Extension - Joint is radiographed while in extension
- Stress Views - Typically taken of joints held in a 'stressed' position. Test of stability.
- HBL or HCR - Horizontal Beam Lateral or Horizontal Central Ray. Used to obtain a lateral view usually when patients are unable to move.
- Prone - Patient lies on their front
- Supine - Patient lies on the back
- Decubitus - Patient lies on their side
- OM - Occulomeatal, an imaginary positioning line extending from the outer canthus of the eye to the external auditory meatus
- Cranial - Tube angulation towards the head
- Caudal - Tube angulation towards the feet
Equipment Used in Projectional Radiography
- Ceiling or Floor Mounted X-ray tube
- Height adjustable table
- Bucky or Digital Detector
- User Interface
- Image Receptor - Film / Screen Cassette or CR Plate / DR Detectors
- Processor or Image Reader
- Chest Stand
Differences around the world
Routine views used in the UK
- Chest - PA Only. Lateral on request by a Radiologist
- Abdomen - AP Only. Decubitus on special request
- Cervical Spine - AP and Lateral. Peg view with trauma only. Obliques and Flexion and Extension on special request
- Thoracic Spine - AP and Lateral
- Lumbar Spine - AP and Lateral +/- L5/S1 view. Obliques and Flexion and Extension requests are rare
- Pelvis - AP only. SIJ Views (prone) on special request
- Hip - AP and Lateral
- Skull - None. Patient goes to CT.
- Sinus - OM with open mouth
- Facial Bones - OM and OM 30°
- Shoulder - AP and Lateral Scapula or Axillary View. Other Special views available on request
- Clavicle - AP and AP Cranial
- Humerus - AP and Lateral
- Elbow - AP and Lateral. Radial head views available on request
- Radius and Ulna - AP and Lateral
- Wrist - AP and Lateral
- Scaphoid - AP with Ulna deviation, Lateral, Oblique and AP with 30° angulation
- Hand - AP and Oblique
- Fingers / Thumb - AP and Lateral
- Femur - AP and Lateral
- Knee - AP and Lateral. Intra Condular views on request
- Patella - Skyline View
- Tibia and Fibula - AP and Lateral
- Ankle - AP and Lateral
- Calcaneum - Axial and Lateral
- Foot / Toes - AP and Oblique
Routine views used in the US
Routine views used in the Australia:
See also
- Radiography
- Medical imaging
- X-ray
- Radiologic technologist
- Computed radiography
- Digital radiography
- Tomography
- Anatomical terms of location
External links
- Radiographers Forum Webiste - Discuss Imaging Projections
- Nice Guidelines
- Philips Medical
- The Human Skeleton
References
- 1.The Pocketbook of Radiographic Positioning by Ruth Sutherland
- 2.Bones and Joints: A Guide for Students by Christine Gunn
- 3.Imaging Atlas of Human Anatomy by Jamie Weir, Peter H. Abrahams
- 4.Nice Guidelines
- 5.The Human Skeleton
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
