Advanced Imaging Modalities

Course Description

Advanced Imaging Modalities covers various advanced imaging modalities, with a focus on the interaction of high-frequency x-rays with computer technology. The curriculum addresses the application of magnetic fields, radio frequency technology, radiopharmaceuticals, and ultrasound techniques, with the primary objective emphasising how physics principles are utilised to generate medical images through computer-based systems.

Within the SCNS taxonomy, RTE is the Radiography prefix. Daytona State publishes this at 3 credits, offered fall, spring and summer, giving approximately 45 contact hours at the prefix's didactic convention.

This course is the gateway to the post-primary certifications that actually raise a technologist's earnings — computed tomography, magnetic resonance, and the rest. It is also where a radiographer meets modalities with entirely different hazard profiles: computed tomography delivers substantially higher doses than plain radiography, and magnetic resonance has no ionising radiation at all but a magnetic hazard that has killed people. Read the MRI safety note below carefully; it is the most important content here.

Daytona State does not publish a lecture and laboratory split for its RTE courses. The prefix runs at several conventions: C-suffixed courses at approximately 20 contact hours per credit (RTE1111C, RTE1457C, RTE1503C, RTE1513C and RTE1523C), L-suffixed laboratories at 32 (RTE1111L, RTE1503L and RTE1513L all at 1 credit and 32 hours), clinical education far higher (RTE1804L at 1 credit and 128 hours), and unsuffixed didactic courses at approximately 15 to 16 (RTE1001 at 1 credit and 16 hours). This course is unsuffixed and didactic, and is priced at that convention.

Learning Outcomes

Required Outcomes

• Describe computed tomography and its physical principles.
• Describe CT image acquisition, reconstruction, and display.
• Describe Hounsfield units and windowing.
• Describe CT dose metrics and dose optimisation.
• Compare CT dose with plain radiography and describe the implications.
• Describe magnetic resonance imaging and its physical basis.
• Describe magnetic fields, radio frequency pulses, and relaxation.
• Describe basic MRI sequences and the contrast they produce.
• Describe MRI safety zones and screening requirements.
• Describe MRI contraindications, including implants and devices.
• Describe nuclear medicine and radiopharmaceuticals.
• Describe the differences between emission and transmission imaging.
• Describe PET and hybrid imaging at an awareness level.
• Describe radiation protection considerations in nuclear medicine.
• Describe ultrasound and its physical principles.
• Describe transducers, frequency, and resolution trade-offs.
• Describe Doppler techniques and their applications.
• Describe the absence of ionising radiation in ultrasound and MRI.
• Compare modalities and describe their appropriate clinical applications.
• Describe how modality choice affects patient dose and safety.
• Describe image quality parameters across modalities.
• Describe artefacts characteristic of each modality.
• Describe post-primary certification pathways.
• Describe cross-sectional anatomy at an introductory level.

Optional Outcomes

• Describe interventional and angiographic imaging.
• Describe mammography and its regulatory framework.
• Describe bone densitometry.
• Describe molecular and functional imaging.
• Describe artificial intelligence in image interpretation.
• Describe emerging imaging technologies.

Major Topics

Required Topics

• Computed tomography principles
• CT acquisition and reconstruction
• Hounsfield units and windowing
• CT dose metrics and optimisation
• Comparing CT and radiographic dose
• MRI physical basis
• Magnetic fields, RF pulses, and relaxation
• MRI sequences and contrast
• MRI safety zones and screening
• MRI contraindications
• Nuclear medicine and radiopharmaceuticals
• Emission versus transmission imaging
• PET and hybrid imaging
• Radiation protection in nuclear medicine
• Ultrasound principles
• Transducers, frequency, and resolution
• Doppler techniques
• Non-ionising modalities
• Comparing modalities and applications
• Modality choice, dose, and safety
• Image quality across modalities
• Characteristic artefacts
• Post-primary certification
• Cross-sectional anatomy

Optional Topics

• Interventional and angiographic imaging
• Mammography and its regulation
• Bone densitometry
• Molecular and functional imaging
• Artificial intelligence in interpretation
• Emerging technologies

Resources & Tools

• ARRT (arrt.org) — free content specifications, eligibility rules, and the ethics review process. Read the eligibility requirements before enrolling anywhere.
• JRCERT (jrcert.org) — free accreditation lookup and programme effectiveness data.
• ASRT (asrt.org) — the American Society of Radiologic Technologists; practice standards, continuing education, and student membership.
• Florida Department of Health — radiologic technology certification — free; the authority on Florida requirements and categories.
• Radiologic Science for Technologists (Bushong) — the standard physics, biology, and protection text.
• Merrill's Atlas of Radiographic Positioning — the positioning standard.
• Image Gently and Image Wisely — free dose-optimisation campaigns for paediatric and adult imaging respectively.
• Your clinical preceptors and the department's protocols — the most valuable resource in the programme.
• ACR Manual on MR Safety — the reference document on magnetic resonance safety practice, and the basis of most departmental policy.
• MRIsafety.com — implant and device compatibility information, widely used in screening.
• Sectional Anatomy for Imaging Professionals (Kelley & Petersen) — the standard cross-sectional anatomy reference.

Career Pathways

• Radiologic technologist — SOC 29-2034.
• Hospital diagnostic radiography — the largest employment setting.
• Outpatient imaging centres and physician practices — frequently better hours.
• Computed tomography — a post-primary certification and one of the most common advancements.
• Magnetic resonance imaging — a post-primary certification with its own distinctive safety regime.
• Mammography — a post-primary certification with specific federal regulatory requirements.
• Interventional and cardiovascular radiography — higher acuity and higher pay.
• Surgical and mobile radiography.
• Radiation therapy and nuclear medicine — related professions with their own certifications.
• Applications specialist and equipment support — manufacturers recruit experienced technologists.
• PACS and imaging informatics administration — a growing, well-paid pathway from the technologist role.
• Clinical education, programme instruction, and imaging management — with additional qualifications.

Special Information

⚠⚠ The MRI magnet is always on — and it has killed people

• This is the single most important safety fact in advanced imaging, and it is counter-intuitive. The magnetic field is permanent. It does not switch off when the scanner is not scanning, when the power is off, or overnight.
• Ferromagnetic objects become projectiles. Oxygen cylinders, infusion poles, chairs, tools, and floor polishers have all been pulled into magnets at speed, and people have been killed and seriously injured by them.
• Screen everyone entering, every time — patients, family, cleaners, engineers, porters, and yourself. The people harmed are frequently not the patient, and they are frequently staff who were not trained because they were "only going in for a moment."
• Know the safety zones and control access to them. Zone restrictions exist precisely because informal access is how objects reach the magnet.
• Screen for implants and devices thoroughly. Pacemakers, neurostimulators, aneurysm clips, cochlear implants, and some prosthetics may be contraindicated or require specific conditions — and patients frequently do not know or do not mention what they have.
• Metallic foreign bodies matter, particularly in the eye; occupational history is part of screening for a reason.
• Radio frequency energy causes heating and burns. Cables must not loop or touch skin, and burns from improper positioning are a documented and preventable injury.
• Acoustic noise requires hearing protection for patients and anyone remaining in the room.
• Know the quench procedure and what a quench looks like — released helium displaces oxygen, and the room must be evacuated.
• ⚠ Never assume an item is safe because it looks non-metallic, and never take an unscreened item into the room to save time.

⚠⚠ Computed tomography delivers far more dose than plain radiography

• A CT examination can deliver a dose many times that of a comparable radiograph, and CT accounts for a disproportionate share of medical radiation exposure.
• Justification matters more here than anywhere. An unjustified CT delivers substantial dose for no benefit, and the technologist is entitled to question an inappropriate request.
• Optimise the protocol to the patient. Paediatric patients are considerably more radiosensitive than adults and must not be scanned on adult protocols — this is precisely what the Image Gently campaign exists to address.
• Scan only the region required, and avoid unnecessary repeat phases; multiphase studies multiply dose.
• Use dose reduction technology — automatic exposure modulation and iterative reconstruction — and understand what each does.
• Know and record the dose metrics, and understand that they describe the scan rather than the individual's absorbed dose.
• Establish pregnancy status per protocol before any CT where it is relevant.
• ⚠ Choose the modality with the patient in mind. Ultrasound and MRI use no ionising radiation, and for some questions they answer it equally well — knowing when to suggest that is a professional contribution.

⚠⚠ Radiation protection — the obligation that defines this profession

• Ionising radiation causes harm that is cumulative and, for some effects, has no threshold below which risk is zero. That is the premise the whole protection framework rests on.
• ALARA — as low as reasonably achievable — is the governing principle, and it applies to the patient, to you, and to everyone else in the room.
• Time, distance, and shielding are the three controls. Distance is the most powerful, because dose falls with the square of distance — stepping back is more effective than most people assume.
• ⚠ The single most effective patient dose reduction is not repeating the examination. A repeat doubles the dose, and repeats are usually caused by positioning or technique errors — which makes technical competence a radiation protection measure.
• Collimate to the area of interest. It reduces patient dose and scatter and it improves image quality — there is no trade-off.
• Use appropriate technique factors and understand the dose consequences of the ones you select.
• Shield where shielding is indicated by current practice, and know that guidance on patient shielding has changed in recent years.
• ⚠ Establish pregnancy status before imaging where it is relevant, following your department's protocol. This is a required step, not a courtesy.
• Wear and correctly position your dosimeter, every shift, and never share or leave it in a radiation area.
• Never hold a patient during an exposure if any alternative exists; use immobilisation, and if a person must hold, it should not be a person occupationally exposed.
• Justification comes first. An examination that is not clinically justified delivers dose for no benefit, and technologists can and should question an inappropriate request.
• ⚠ Rule 11 applies — dose limits, shielding guidance, and regulatory requirements change; follow current regulation and departmental protocol.

⚠⚠ Certification and licensure in radiography — verify before you enrol

• The recognised credential is ARRT certification and registration, awarded by the American Registry of Radiologic Technologists. It is what employers require and what most state licensure is built on.
• ⚠⚠ Eligibility generally requires completion of an ARRT-recognised educational programme, and radiography programmes are typically accredited by JRCERT. Confirm a programme's accreditation and ARRT recognition before enrolling — the same unrecoverable trap recorded here for CAPTE, CAAHEP, ACOTE, and CoARC.
• Florida licenses radiologic technologists through the Department of Health, and practising without the required licence is an offence. Florida issues several categories of radiologic technology certification with differing scopes.
• Post-primary certifications extend scope — computed tomography, magnetic resonance, mammography, interventional, and others — and they are the principal route to higher pay in this field.
• ARRT requires continuing education and adherence to its ethics requirements for continued registration, and it takes the ethics provisions seriously.
• Background screening and health clearance are required for clinical placement and for licensure. ARRT applies an ethics review to applicants with criminal history — and its pre-application review process exists precisely so this can be established early. Use it before investing in the programme.
• ⚠ Rule 11 applies. Verify with the ARRT, JRCERT, and the Florida Department of Health rather than relying on this guide.

How Florida course levels affect transfer

The first digit of an SCNS number denotes the year of offering, not transferability. Courses at the 1000 and 2000 levels transfer transparently between Florida public institutions, and 3000 to 4000 is unproblematic since both are upper division. The boundary that actually matters is 2000 to 3000, where lower-division credit generally cannot satisfy an upper-division requirement — and it is live here, since Daytona State offers both associate-level and bachelor of applied science coursework in this prefix.

RTE4574 is 3 credits and approximately 45 contact hours, offered fall, spring and summer at Daytona State.

Post-primary certification is the principal route to higher pay in this profession — this course is the introduction to those pathways. See the certification note above.