To specialize in an imaging field like mammography or CT (computed tomography) as a radiologic technologist (RT/RAD Tech), you typically complete post-primary certification after becoming a registered radiographer. The exact steps vary by employer and state, but the general pathway looks like this:
1. Become a radiologic technologist first
Most technologists start by:
Completing an accredited radiologic technology program (usually an associate degree).
Passing the certification exam for American Registry of Radiologic Technologists (ARRT) in Radiography (R).
Meeting any state licensing requirements.
Your initial radiography credential becomes the foundation for adding specialties.
Specializing in an advanced modality like Computed Tomography (CT) or Mammography as a registered radiologic technologist typically happens through the postprimary eligibility pathway . In the United States, this process is primarily overseen by the American Registry of Radiologic Technologists (ARRT).
The general roadmap to transition into and specialize in these fields involves three core requirements:
Yes. In the U.S., specialization usually happens after you become a radiologic technologist, rather than choosing CT or mammography as your initial degree.
To specialize in computed tomography (CT) or mammography as a radiologic technologist, you must hold a primary certification in radiography (R.T.R.) and complete the American Registry of Radiologic Technologists (ARRT) Postprimary Pathway , which requires structured education, clinical experience, and a board exam.
To specialize in areas like mammography or CT, most radiologic technologists follow a postprimary certification pathway after becoming a registered radiographer.
Earn your radiography credential
Complete an accredited radiologic technology program.
To specialize in a field like mammography or CT as a radiologic technologist, you must complete structured education, fulfill specific clinical experience requirements, and pass a post-primary certification exam through an organization like the
Absolutely. If you’re already a radiologic technologist (R.T.), specializing in areas such as mammography, CT, MRI, or interventional radiology is usually a matter of gaining additional education, clinical experience, and certification rather than starting over with another degree.
In the U.S., the main pathway is through the American Registry of Radiologic Technologists (ARRT).
Specializing in a modality like Mammography or Computed Tomography (CT) as a radiologic technologist typically follows the postprimary pathway offered by organizations like the American Registry of Radiologic Technologists (ARRT).
Specializing in a postprimary discipline like Mammography or Computed Tomography (CT) as a radiologic technologist typically follows the Postprimary Pathway outlined by the .
Yes. If you’re already a radiologic technologist (R.T.), specializing in an area such as CT or mammography is a very common next step. In the U.S., the main organization you'll deal with is the American Registry of Radiologic Technologists (ARRT).
The basic career path
Typically, it looks like:
Radiography → gain experience → choose a specialty → complete specialty education + clinical training → take the ARRT specialty exam → become credentialed in that specialty.
ARRT calls this the postprimary pathway. It currently includes specialties such as .
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Work as a radiographer and gain experience with X-ray procedures.
Complete CT-specific education (often through:
employer training,
a CT certificate course,
continuing education providers).
Complete required CT clinical experience and structured education.
Pass the ARRT CT exam.
ARRT’s CT post-primary pathway requires an appropriate supporting credential (such as Radiography), structured education, documented clinical experience, and an exam.
CT technologists commonly work in:
hospitals,
emergency departments,
trauma centers,
outpatient imaging centers.
The work involves operating CT scanners, optimizing image quality, and balancing diagnostic needs with radiation dose considerations.
Mammography
A typical route:
Become ARRT-certified in Radiography.
Complete mammography education and clinical training.
Document required mammography procedures and quality-control experience.
Pass the ARRT Mammography exam.
ARRT lists Mammography as a post-primary credential requiring a supporting discipline (Radiography), structured education, clinical experience, and examination.
Mammography technologists often work in:
breast imaging centers,
hospitals,
women's health clinics.
The specialty also involves patient communication because exams can be uncomfortable or anxiety-provoking for patients.
3. Get hands-on experience
Many technologists specialize by:
asking their current employer for cross-training opportunities,
applying for entry-level positions in CT or mammography departments,
completing clinical rotations or internships,
finding a mentor in the specialty.
4. Consider which specialty fits your interests
CT may appeal to you if you like:
fast-paced hospital environments,
emergency imaging,
anatomy and technology,
working with many types of patients.
Mammography may appeal to you if you like:
more patient interaction,
preventive healthcare,
detailed positioning and image quality,
building patient trust.
5. Keep building credentials
After CT or mammography, some technologists add other modalities such as:
MRI,
interventional radiography,
bone densitometry,
breast imaging specialties.
If you’re currently a student, an X-ray tech, or already an RT(R), the best next steps differ slightly.
Meet the Prerequisite Certification : You must first hold a primary ARRT certification and registration in Radiography (R.T.R.).
Complete Structured Education : You are required to complete a minimum of 16 hours of structured education specific to the discipline (CT or Mammography) you are pursuing. This education must be formal coursework and is designed to bridge foundational X-ray knowledge into advanced cross-sectional or breast imaging principles.
Fulfill Clinical Experience Requirements : You must document a specific number and variety of clinical competency procedures.
For CT: You'll need to perform a range of mandated scans (e.g., neurological, body, musculoskeletal procedures) while adhering to daily logging limits (maximum of nine entries per day).
For Mammography: You'll need hands-on positioning and quality control experience, following specific daily documentation limits (maximum of 16 entries per day) alongside targeted elective competencies like needle localizations or diagnostic workups.
Pass the Registry Exam : Once your education and clinical requirements are verified and approved by the ARRT, you sit for the registry certification exam in your chosen specialty. Passing grants you your advanced credential.
Note for Mammography: Because mammography involves strict federal regulations under the Mammography Quality Standards Act (MQSA), you will also need to meet specific initial training requirements (like performing a designated number of exams under direct supervision) before you can independently image patients.
If you want to move forward, tell me:
Which specialty (CT or Mammography ) are you leaning toward first?
Are you currently working in a hospital or imaging center that might allow you cross-training hours?
I can help outline the specific clinical competencies or recommended study resources for your chosen path.
Mammography has a more specific prerequisite: you must first be certified and registered in Radiography for the ARRT postprimary mammography pathway.
Mammography involves specialized breast imaging, including screening and diagnostic examinations, so patient communication and positioning skills are particularly important.
Other specialties you can consider
Once you're an R.T., you can potentially move into:
CT
Mammography
MRI
Interventional radiography
Cardiac interventional radiography
Bone densitometry
Vascular/interventional imaging
Breast sonography (with the appropriate prerequisites)
ARRT's postprimary pathway covers these additional credentials.
One important point: you don't necessarily need to go back for another full two-year degree for each specialty. The postprimary pathway is specifically designed to let an already-qualified imaging professional add credentials through focused education, clinical experience, and an examination.
If you're currently deciding what radiologic technology program to attend, I can also break down CT vs. MRI vs. mammography vs. X-ray in terms of schooling, typical work environment, patient interaction, and career progression.
Pass the registry exam and become an R.T.(R) (often through ARRT).
Gain clinical experience in your specialty
Work with a department that offers CT, mammography, or another modality.
Complete required clinical procedures and structured education for the specialty.
Complete specialty education
Take approved coursework in topics such as anatomy, imaging protocols, patient care, radiation safety, and equipment operation.
Pass the specialty certification exam
For CT: earn the ARRT Computed Tomography (CT) credential.
For mammography: earn the ARRT Mammography (M) credential.
Common career paths:
R.T.(R) → CT technologist → advanced CT roles
R.T.(R) → Mammography technologist → breast imaging roles
You can also add credentials in MRI, breast sonography, or other imaging specialties.
Many technologists choose a specialty based on whether they prefer emergency imaging (CT), preventive and diagnostic breast care (mammography), faster-paced hospital work, or more scheduled outpatient settings.
American Registry of Radiologic Technologists (ARRT)
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Specializing allows you to expand your clinical capabilities, work in advanced medical settings, and often earn a higher salary. The transition process follows a clear set of sequential steps.
Steps to Specialization
Maintain your primary certification: Ensure your initial Registered Technologist (R.T.) credential in radiography (R.T.R) is active and in good standing with the ARRT.
Complete structured education: Fulfill the specific structured education requirements mandated by the ARRT for your chosen specialty (e.g., specific educational contact hours covering physics, procedures, and safety protocols for CT or Mammography). Programs are offered through hospitals, colleges, or continuing education providers like Medical Technology Management Institute (MTMI).
Log clinical competencies: Gain hands-on practical experience under supervision at a clinical site. You must complete a specific number of mandatory and elective patient procedures (competencies) and log them according to ARRT clinical requirements.
Apply and pass the registry exam: Submit your documentation and application verifying your structured education and completed clinical requirements, then schedule and pass the ARRT post-primary certification exam in your target modality.
For many specialties, your first credential is ARRT(R) in radiography.
Mammography specifically requires you to already be certified and registered in radiography.
Choose your specialty
Common options include: - CT (Computed Tomography)
Mammography
MRI
Bone densitometry
Interventional radiography
Vascular/interventional specialties
ARRT calls this the postprimary pathway.
Get specialty-specific education
You'll need structured education in the specialty. ARRT's current postprimary pathway includes a structured-education requirement.
Work in that modality and document clinical experience
This is an important part of the process. You perform specified procedures under appropriate supervision and document them through ARRT's clinical-experience system.
For example, if you're pursuing CT, you would need hands-on experience performing CT procedures.
Pass the specialty ARRT exam
After completing the education and clinical requirements, you apply and take the specialty examination.
Maintain your credentials
You'll need to keep up with ARRT's continuing qualifications and any state-specific licensing requirements.
CT vs. mammography
CT can be a particularly natural progression for a radiologic technologist. ARRT currently allows CT candidates to use Radiography, Nuclear Medicine Technology, or Radiation Therapy as the supporting discipline.
CT tends to be a good fit if you enjoy:
Emergency/trauma imaging
Anatomy and pathology
Working with advanced technology
IV contrast and dynamic studies
A faster-paced hospital environment
Mammography requires radiography as the supporting discipline. You'll learn specialized breast positioning, imaging techniques, patient communication, and breast-imaging procedures.
Mammography can be a good fit if you enjoy:
More specialized imaging
Patient interaction and education
Breast anatomy/pathology
Screening and diagnostic imaging
Developing very precise positioning skills
One important thing
You don't necessarily need to go back to college for another full radiologic technology program. If you're already an ARRT-registered R.T., you can generally pursue specialties through the postprimary pathway. ARRT requires the supporting credential, structured education, clinical experience, and examination.
If you're currently in radiologic technology school or are considering becoming an R.T., the path would look roughly like:
Radiography program → ARRT(R) → get hired → choose CT/Mammo/MRI/etc. → specialty education + clinical experience → specialty ARRT credential
If you tell me whether you're already an R.T., currently in school, or just considering radiologic technology, I can lay out the exact path to CT vs. mammography, including how long each typically takes and what the day-to-day work is like.
Here is the step-by-step roadmap to earning your postprimary certification and transitioning into a specialized role:
Prerequisite Credentials : Hold an active primary ARRT certification and registration in a supporting discipline (most commonly Radiography, though Nuclear Medicine or Radiation Therapy may apply depending on the specific modality).
Structured Education : Complete a specific number of continuing education or structured education credits tied to the modality (e.g., specific hours covering patient care, physics, instrumentation, and procedures for CT or Mammography). You can review guidelines via the ARRT Postprimary Eligibility Pathway Handbook.
Clinical Experience : Perform and document a required number of mandatory and elective clinical procedures under direct supervision. You will log these procedures using the ARRT online tracking tool, keeping within daily procedure limits. For mammography, note that you also have to satisfy specific MQSA (Mammography Quality Standards Act) initial training requirements.
Application and Ethics : Submit your application, verification of completed structured education, clinical requirements, and ethics fee to the registry.
Pass the Examination : Study the specific content specifications and task inventory for your chosen exam, then pass the computerized registry exam to officially earn your advanced credential.
Are you currently leaning more toward Mammography or CT , and do you already hold your primary Radiography (R) credential? I can share specific exam breakdown tips or clinical hour targets for your choice.
American Registry of Radiologic Technologists (ARRT)
The general roadmap to earn an advanced credential involves four main phases: prerequisites, structured education, clinical experience, and the registry exam.
1. Meet the Prerequisite Discipline
Before you can pursue a specialty, you must hold a primary certification and registration in a qualifying discipline:
For Mammography: You must be certified and registered in Radiography (R.T. (R)).
For CT: You must be certified and registered in Radiography, Nuclear Medicine Technology, or Radiation Therapy (credentials from the NMTCB also qualify for nuclear medicine technologists).
2. Complete Structured Education
You must complete a specific number of continuing education or structured education credits related to the specific modality.
This education must meet ARRT guidelines (usually a designated number of academic credits or structured education courses covering patient care, safety, instrumentation, and procedures specific to mammography or CT).
You are required to perform a mandatory set of clinical procedures and quality control tests under the supervision of a qualified professional.
Mammography: Requires completing a specific number of clinical procedures (such as 75 patient examinations including screening/diagnostic cases) and quality control tasks, plus specific physician consultations.
CT: Requires documenting a specific variety of mandatory procedural competencies (e.g., specific head, spine, musculoskeletal, and body scans) before applying.
4. Apply and Pass the Registry Exam
Once your structured education and clinical requirements are signed off and verified in your online ARRT account:
Submit your application and fee to the ARRT Initial Application Process.
Schedule and pass the comprehensive certification examination for your chosen modality.
Maintain your credentials annually by completing continuing education (CE) credits and complying with ARRT ethics requirements.
If you'd like, I can provide:
Specific clinical competency counts for CT vs. Mammography
Recommendations on finding structured education courses
Tips on studying for the registry exam
Let me know which modality you are leaning toward!
Computed Tomography (CT), Mammography, MRI, Bone Densitometry, and several interventional specialties
1. Start with ARRT Radiography
If you're not an R.T. yet, your first step is generally an ARRT-approved radiography program, followed by the ARRT Radiography exam. The primary pathway requires an associate degree or higher.
Once you're an ARRT-registered radiographer, you can pursue additional credentials through the postprimary pathway.
2. Choose your specialty
Two especially common choices are:
CT (Computed Tomography)
You'll learn cross-sectional anatomy, CT protocols, contrast administration, radiation dose optimization, trauma imaging, angiography, and more. CT can be a good choice if you enjoy technology, anatomy, emergency/trauma imaging, and working with relatively complex exams.
Mammography
You'll specialize in breast imaging, including screening and diagnostic mammography. There's also a significant patient-care component because patients may be anxious or uncomfortable during breast exams. ARRT specifically requires Radiography as the supporting credential for Mammography.
3. Get specialty training at a hospital or imaging center
This is an important part that people sometimes overlook.
You don't necessarily have to go back to school for a completely new degree. For postprimary certification, ARRT requires structured education plus documented clinical experience in the specialty.
For example, you might be working as a radiographer at a hospital and tell your supervisor:
"I'd like to cross-train into CT."
The department may train you on the scanner while you work under appropriate supervision. You'll document the required clinical procedures for ARRT.
4. Complete the required education
ARRT currently requires 16 hours of structured education for postprimary credentials. The education has to cover the required content areas for your specialty.
You also have to document the required clinical procedures. ARRT's requirements are discipline-specific, and your clinical experience has to be properly documented and verified.
5. Take the specialty ARRT exam
Once you've met the education, ethics, and clinical requirements, you apply for the postprimary exam and take the examination for your specialty.
After passing, you can hold an additional ARRT credential, such as:
One particularly useful thing to know: CT and mammography aren't necessarily mutually exclusive. You can earn additional credentials over the course of your career. ARRT's postprimary pathway is specifically designed for R.T.s who want to add specialties.
If you're deciding between CT and mammography
I'd generally suggest CT first if your priority is maximizing the number of hospitals/jobs you can work in and you're comfortable with a faster-paced environment.
I'd lean toward mammography if you prefer outpatient imaging, building patient relationships, and breast imaging specifically.
If you tell me where you are in the process (e.g., still in school, already an R.T., or currently working in X-ray), I can lay out a step-by-step roadmap for getting into CT or mammography, including roughly how long each path takes and what the pay/career outlook tends to look like.
