Study tools
Interactive Diagrams
Drag the sliders to see how key ARRT concepts actually behave, not just static pictures to memorize. Diagrams marked in progress are on the way.
Image Production
Image Production · Automatic Exposure Control
AEC: What the Cell Sees
Study how the tissue covering the active AEC cell determines your exposure time.
Lesson: AEC & technique charts
Image Production · Image Quality
Beam Geometry: SID, OID & Image Quality
Study how magnification and focal-spot blur change as you move the tube and the part.
Lesson: Primary exposure factors
Image Production · Digital Imaging
CR & DR Image Receptors
Look inside the PSP plate and the flat panel to compare direct and indirect conversion, layer by layer.
Lesson: Digital receptors: CR & DR
Image Production · X-Ray Generator
Electrical / X-ray Circuit
Follow voltage through the x-ray circuit from the autotransformer to the rectifiers.
Lesson: Electrical / x-ray circuit
Image Production · Grids
Grid Ratio & Grid Cutoff
Study different grid errors and their corresponding negative effects on image receptor exposure.
Lesson: AEC & technique charts
Image Production · Fluoroscopy
Image Intensifier
Follow the signal from input phosphor to output phosphor to see where brightness gain comes from.
Lesson: Fluoroscopic equipment
Image Production · Image Quality
Shape Distortion: Elongation & Foreshortening
Compare five CR, part, and receptor arrangements to see how each one distorts the image.
Lesson: Primary exposure factors
Image Production · X-Ray Tube
X-Ray Tube Construction
Explore how an x-ray tube's angled target drives the Line-Focus Principle and the Anode Heel Effect.
Lesson: X-ray tube & components
Radiation Safety
Safety · Radiation Biology
Dose-Response Curves
Compare threshold versus nonthreshold and deterministic versus stochastic dose-response curves.
Lesson: Radiation biology
Safety · X-Ray Production
Electron Interactions: How X-Rays Are Made
Follow one electron from the cathode to the anode and watch it become an x-ray.
Lesson: X-ray production & interactions
Safety · Radiation Protection
Fluoro Room Exposure Map
Compare primary, scatter, and leakage radiation as you toggle the protective curtain around the fluoro table.
Lesson: Personnel protection & ALARA
Safety · Interactions with Matter
Inside the Patient: What Happens to Each X-Ray
Study each photon interaction the beam can have inside the patient, one step at a time.
Lesson: Interactions with matter
Safety · Radiation Protection
Inverse Square Law
Drag the distance to watch beam intensity fall away and see the math behind distance as a protection tool.
Lesson: Personnel protection & ALARA
Safety · Occupational Dosimetry
Personnel Dosimeters
Compare the OSL, TLD, film badge, and pocket chamber to see how each works and where it belongs on your body.
Lesson: Detection & occupational dosimetry
Safety · Interactions with Matter
Photon Interactions with Matter
Compare photoelectric, Compton, and coherent interactions to see which dominates at each energy and how it affects dose and contrast.
Lesson: Interactions with matter
Safety · X-Ray Production
X-Ray Emission Spectrum
Adjust kVp, mAs, and filtration to watch the bremsstrahlung curve and characteristic peaks shift in real time.
Lesson: X-ray production & interactions
Procedures
Procedures · Lower Extremity
Ankle Positioning Series
Explore the ankle's anatomy, then use Practice mode to position the AP, mortise, oblique, and lateral projections yourself.
Lesson: Foot & ankle
Procedures · Abdomen & GI
Barium Enema: Which Position Opens What
Review the nine positions of the barium enema routine side by side at one scale.
Lesson: Fluoroscopic GI studies
Procedures · Head, Spine and Pelvis
Cervical Spine Positioning Series
Compare the four routine cervical spine projections: open mouth, AP axial, oblique, and lateral.
Lesson: Vertebral column
Procedures · Skull & Facial
Cranial Baselines & Landmarks
Study the OML, IOML, and other skull landmarks to see which named projection uses which line.
Lesson: Skull / facial / sinuses
Procedures · Upper Extremity
Elbow Positioning Series
Compare the AP, flexion alternates, obliques, and lateral projections of the routine elbow series.
Lesson: Forearm & elbow
Procedures · Abdomen & GI
Esophagram: The Five Positions
Review the five positions of the esophagram routine side by side at one scale.
Lesson: Fluoroscopic GI studies
Procedures · Head, Spine and Pelvis
Facial Bones Positioning Series
Study all fourteen facial bones through the three routine facial projections: lateral, Waters, and Caldwell.
Lesson: Skull / facial / sinuses
Procedures · Lower Extremity
Femur Positioning Series
Explore the femur's anatomy, then use Practice mode to position the AP and lateral projections yourself.
Lesson: Knee & femur
Procedures · Lower Extremity
Foot Positioning Series
Explore the foot's anatomy, then use Practice mode to position the AP axial, oblique, and lateral projections yourself.
Lesson: Foot & ankle
Procedures · Upper Extremity
Forearm Positioning Series
Compare the AP and lateral projections of the routine forearm series, both showing the wrist and elbow.
Lesson: Forearm & elbow
Procedures · Upper Extremity
Hand Positioning Series
Explore the hand's anatomy, then use Practice mode to position the PA, oblique, and lateral projections yourself.
Lesson: Hand & wrist
Procedures · Upper Extremity
Humerus Positioning Series
Compare the AP and rotational lateral projections of the routine humerus series.
Lesson: Shoulder girdle
Procedures · Lower Extremity
Knee Positioning Series
Explore the knee's anatomy, then use Practice mode to position the AP, oblique, and lateral projections yourself.
Lesson: Knee & femur
Procedures · Head, Spine and Pelvis
Lumbar Spine Positioning Series
Compare the three routine lumbar spine projections: AP, oblique, and lateral.
Lesson: Vertebral column
Procedures · Head, Spine and Pelvis
Mandible and TMJ Positioning Series
Study the mandible and temporomandibular joints through all four routine projections: axiolateral oblique, PA, and two AP axial views.
Lesson: Skull / facial / sinuses
Procedures · Head, Spine and Pelvis
Pelvis and Hip Positioning Series
Explore the pelvis and hip, then use Practice mode to position each routine projection yourself.
Lesson: Pelvis, hip & SI joints
Procedures · Positioning Foundations
Positioning Terminology
Rotate the patient between the x-ray tube and the image receptor to see how every projection and position gets its name.
Lesson: Positioning foundations
Procedures · Chest & Thorax
Ribs Positioning Series
Compare the AP, PA, and axillary oblique projections of the routine rib series.
Lesson: Chest & thorax
Procedures · Head, Spine and Pelvis
Sacrum, Coccyx and SI Joint Positioning Series
Study the sacrum, coccyx, and sacroiliac joints through their routine axial and oblique projections.
Lesson: Pelvis, hip & SI joints
Procedures · Upper Extremity
Scapula Positioning Series
Compare the AP and lateral projections of the routine scapula series.
Lesson: Shoulder girdle
Procedures · Upper Extremity
Shoulder Positioning Series
Compare AP external and AP internal rotation in the routine nontrauma shoulder series.
Lesson: Shoulder girdle
Procedures · Head, Spine and Pelvis
Skull Positioning Series
Compare the four routine skull projections: Towne, lateral, Caldwell, and straight PA.
Lesson: Skull / facial / sinuses
Procedures · Abdomen & GI
Small Bowel Series: How Far the Barium Has Got
Follow the small bowel series as a timed clock, from the stomach to the cecum.
Lesson: Fluoroscopic GI studies
Procedures · Head, Spine and Pelvis
Thoracic Spine Positioning Series
Compare the AP and lateral projections of the routine thoracic spine series.
Lesson: Vertebral column
Procedures · Lower Extremity
Tibia and Fibula Positioning Series
Explore the tibia and fibula's anatomy, then use Practice mode to position the AP and lateral projections yourself.
Lesson: Knee & femur
Procedures · Upper Extremity
Upper Extremity Anatomy in 3D
Explore the hand, wrist, elbow, and shoulder rendered from a true 3D skeleton, with every structure labeled.
Lesson: Hand & wrist
Procedures · Abdomen & GI
Upper GI Series: Where the Barium Goes
Review the five positions of the upper GI routine side by side at one scale.
Lesson: Fluoroscopic GI studies
Procedures · Upper Extremity
Wrist Positioning Series
Explore the wrist's anatomy, then use Practice mode to position the PA, oblique, and lateral projections yourself.
Lesson: Hand & wrist