Radiographic Imaging II

Course Description

RTE1457C – Radiographic Imaging II is the second course in the radiographic exposure and image production sequence. Daytona State College titles it Radiographic Exposures II and Lab, Gulf Coast State College Principles of Radiographic Exposure II, and Eastern Florida State Principles of Radiographic Imaging 2 — three titles for the same place in the curriculum.

Where the positioning courses teach where to put the patient, the imaging courses teach why an image looks the way it does and how to change it deliberately. This is the physics and technique half of radiography: the relationship between exposure factors and image quality, how digital receptors respond, what produces noise and artifacts, and how to correct a suboptimal image on the second attempt rather than by trial and error.

Content covers x-ray production and interaction with matter; prime exposure factors — kVp, mAs, and distance, and their effects on density, contrast, and dose; the inverse square law and exposure maintenance formulas; beam filtration and collimation; scatter radiation — production, control, grids, grid ratio, grid errors, and the air gap technique; image receptors — computed and digital radiography, detector types, and their response characteristics; digital image processing — histogram analysis, look-up tables, and the exposure indicator; image quality — spatial resolution, contrast resolution, noise, and detective quantum efficiency; geometric factors — magnification, distortion, and focal spot blur; artifacts and their causes; automatic exposure control and its correct and incorrect use; technique charts and adaptation for patient size and pathology; fluoroscopy and mobile imaging exposure considerations; and radiation protection and dose optimization.

Offered at approximately 11 Florida institutions with JRCERT-accredited radiography programs.

Learning Outcomes

Required Outcomes

• Describe x-ray production and the interactions of x-rays with matter.
• Explain the effect of kVp on beam quality, image contrast, and patient dose.
• Explain the effect of mAs on beam quantity, image receptor exposure, and dose.
• Apply the inverse square law and exposure maintenance formulas to technique changes.
• Calculate technique adjustments to maintain receptor exposure across changed conditions.
• Describe beam filtration and collimation and their effect on dose and image quality.
• Explain scatter production and select appropriate scatter control methods.
• Select appropriate grids and identify grid errors from image appearance.
• Describe computed and digital radiography receptors and their response characteristics.
• Explain digital image processing including histogram analysis and look-up tables.
• Interpret the exposure indicator and use it to evaluate technique.
• Evaluate images for spatial resolution, contrast, noise, and overall quality.
• Apply geometric principles including magnification, distortion, and focal spot blur.
• Identify artifacts, determine their cause, and describe the correction.
• Use automatic exposure control appropriately and recognize when it will fail.
• Use and adapt technique charts for patient size, habitus, and pathology.
• Apply radiation protection principles and dose optimization to technique selection.
• Produce and evaluate images in the laboratory to program standards.

Optional Outcomes

• Describe quality control testing of radiographic equipment.
• Describe pediatric dose reduction strategies.
• Describe fluoroscopic exposure and dose management.
• Describe PACS, DICOM, and image display considerations.
• Describe dose monitoring and diagnostic reference levels.
• Relate imaging content to the ARRT examination content specifications.

Major Topics

Required Topics

• X-ray production — the tube, target interactions, and beam characteristics.
• Beam attenuation — photoelectric and Compton interactions and subject contrast.
• kVp — penetration, contrast, scatter, and the 15 percent rule.
• mAs — quantity, reciprocity, and receptor exposure.
• Distance — inverse square law and the exposure maintenance formula.
• Filtration and collimation — inherent, added, and their dose effects.
• Scatter control — grids, grid ratio, focused grids, grid errors, and air gap.
• Digital receptors — CR plates, DR detectors, direct and indirect conversion.
• Digital processing — histograms, values of interest, and look-up tables.
• Exposure indicator — interpretation, standardization, and dose creep.
• Image quality — spatial and contrast resolution, noise, and signal-to-noise ratio.
• Geometric factors — SID, OID, magnification, distortion, and penumbra.
• Artifacts — receptor, processing, exposure, and patient artifacts.
• Automatic exposure control — detector selection, backup time, and failure modes.
• Technique charts — construction, use, and adaptation.
• Pathology and technique — additive and destructive conditions.
• Radiation protection — ALARA, shielding, and dose optimization.
• Laboratory — controlled exposure experiments and image evaluation.

Optional Topics

• Equipment quality control.
• Pediatric dose reduction.
• Fluoroscopic dose management.
• PACS, DICOM, and display.
• Dose monitoring and reference levels.
• ARRT content specification mapping.

Resources & Tools

• Radiographic Imaging and Exposure (Fauber), Elsevier — the standard text for this sequence.
• Principles of Radiographic Imaging: An Art and a Science (Carlton & Adler), Cengage.
• Radiologic Science for Technologists (Bushong), Elsevier — the comprehensive physics reference.
• Energized laboratory — controlled exposure experiments are how the relationships become concrete rather than memorized.
• Phantoms and step wedges — for demonstrating contrast and density relationships.
• PACS workstation — for image evaluation and exposure indicator review.
• ARRT — Radiography examination content specifications; image production is a large section.
• Florida Department of Health, Bureau of Radiation Control — state equipment and operator rules.

Career Pathways

• Radiologic Technologist (SOC 29-2034) — via ARRT certification and Florida licensure.
• Advanced modality technologist — CT and MRI, where the physics foundation carries directly.
• Quality control technologist — equipment testing and image quality programs.
• Applications specialist — equipment vendors; this content is the basis of the role.
• PACS administrator — health systems.
• Clinical instructor — with experience and often a bachelor's degree.

Special Information

⚠ Credits vary from 2 to 4 — an unusually wide spread

Florida institutions differ substantially on this course: Gulf Coast State College carries it at 4 credits, Eastern Florida State College at 2, and combined C-suffix versions elsewhere fall between. Titles differ too — Radiographic Imaging II, Principles of Radiographic Exposure II, and Principles of Radiographic Imaging 2. Note also that RTE1457 and RTE2457 are different courses: RTE1457 is the first-year exposure and image production course, while Broward's RTE2457 Imaging II is a second-year advanced course with its own prerequisites. SCNS equivalency applies to the same number at the same level, never across numbers — verify which your program requires.

Digital imaging changed what a technologist has to watch for

The most important conceptual shift in the course. On film, an overexposed image looked dark and an underexposed one looked light — the error was visible. Digital systems rescale the histogram, so a substantially overexposed image can look perfectly acceptable while delivering far more dose than necessary. The only reliable indicator is the exposure indicator, and the professional obligation is to check it on every image. The industry term for the resulting problem is dose creep — the gradual drift toward higher technique because higher exposure hides noise and nobody sees the cost. Students should leave understanding that "the image looks fine" is not evidence that the technique was appropriate.

Learn the relationships, not the numbers

The examinable and professionally useful skill is knowing what changes when you change something: increase kVp and you increase penetration and scatter while decreasing contrast; double the distance and receptor exposure falls to a quarter; increase grid ratio and you clean up scatter at the cost of dose and positioning latitude. Students who memorize technique chart values without understanding the relationships cannot adapt to a patient who does not match the chart — which is most of them.

Automatic exposure control fails in predictable ways

AEC terminates exposure when the selected detectors receive enough radiation, which means it fails when the anatomy is not over the detector, when a prosthesis or dense pathology sits over it, or when the patient is positioned off-center. The result is an under- or overexposed image with a plausible-looking technique. Knowing when not to use AEC is as important as knowing how.

This content is heavily represented on the ARRT examination

Image production is one of the largest sections of the ARRT Radiography examination content specifications. Students who treat the imaging sequence as the difficult theory course to survive, rather than as core examinable content, tend to struggle at certification. Practicing exposure calculations regularly rather than cramming is the approach that works.

Florida requires state licensure in addition to ARRT certification

Practicing in Florida requires a Florida Department of Health certification through the Bureau of Radiation Control, separate from and in addition to ARRT registration. Both are required and renew on different schedules.