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Key Facts: CMRI Radiología Exam

3 phases

Ciencias Básicas, Radiología Clínica, and Razonamiento Clínico, all online

CMRI Reglamento de Exámenes 2026

11–12 Feb 2027

Next Fase 1 and Fase 2 exams (registration by 4 Dec 2026)

CMRI Calendario 2027

MXN 3,000–4,300

Fee per exam phase

CMRI Tabla de costos

8 + 11

Basic-science subjects and clinical radiology areas

CMRI Reglamento de Exámenes 2026

MXN 8,000

Recertification fee

CMRI Tabla de costos

CMRI certification is the CONACEM-recognized board process for radiology in Mexico: three online exams (Ciencias Básicas from R2, Radiología Clínica, and Razonamiento Clínico at the end of residency), with 2027 sittings from February to October and fees of MXN 3,000–4,300 per exam.

Sample CMRI Radiología Practice Questions

Try these sample questions to review concepts for the CMRI Radiología exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 105+ question experience with AI tutoring.

1In a diagnostic X-ray tube with a tungsten target operating at 100 kVp, which physical mechanism accounts for the vast majority of the emitted X-ray photon spectrum?
A.Bremsstrahlung (braking) radiation produced by incident electron deceleration near target nuclei
B.Characteristic radiation produced by electron transitions into the tungsten K-shell vacancy
C.Coherent (Rayleigh) scattering occurring between low-energy electrons and orbital shells
D.Pair production occurring when incident photon energy exceeds 1.022 MeV
Explanation: At diagnostic tube potentials (e.g., 100 kVp with a tungsten target), approximately 80% to 90% of the continuous X-ray spectrum consists of bremsstrahlung (braking) radiation, produced as bombarding electrons are deflected and decelerated by the positive nuclear electrostatic field of target atoms.
2In multidetector helical computed tomography (MDCT), how does increasing the pitch from 1.0 to 1.5 affect patient radiation dose and scan acquisition time when tube current (mA) and rotation time remain constant?
A.Radiation dose increases proportionally while scan acquisition time is prolonged
B.Radiation dose decreases by approximately 33% and scan acquisition time decreases
C.Radiation dose remains unchanged because effective mAs is automatically quadrupled
D.Radiation dose doubles while spatial resolution along the z-axis is strictly preserved
Explanation: Pitch is defined as table travel per 360-degree rotation divided by the nominal beam collimation. When pitch increases from 1.0 to 1.5 at constant tube current and rotation time, the patient moves faster through the beam, reducing effective mAs and radiation dose (CTDIvol) by approximately 33% (dose ∝ 1/pitch), while shortening acquisition time.
3A contrast-enhanced chest CT report shows a volume CT dose index (CTDIvol) of 10 mGy and a total scan length of 30 cm along the z-axis. What is the calculated Dose-Length Product (DLP)?
A.30 mGy·cm
B.100 mGy·cm
C.300 mGy·cm
D.3,000 mGy·cm
Explanation: Dose-Length Product (DLP) is calculated as CTDIvol multiplied by the scan length along the z-axis: DLP = 10 mGy × 30 cm = 300 mGy·cm. DLP reflects the total integrated radiation energy absorbed along the scanned anatomical volume.
4During a head CT scan, dark streaking bands are observed traversing the posterior cranial fossa between the dense petrous temporal bones. What is the primary physical cause of this artifact and the most effective acquisition adjustment to mitigate it?
A.Ring artifact from miscalibrated detector elements; correct by executing detector air calibration protocols
B.Photon starvation from inadequate tube current through dense petrous bone; correct by lowering kVp to 80
C.Voluntary patient swallowing motion artifact; correct by head immobilization and increasing slice thickness
D.Beam hardening from preferential absorption of lower-energy photons; correct by increasing kVp and using specialized correction algorithms
Explanation: Beam hardening occurs when a polychromatic X-ray beam traverses dense bony structures (such as petrous ridges); lower-energy photons are preferentially absorbed, shifting the mean energy higher and causing cupping or dark streak artifacts (Hounsfield artifact). Increasing kVp, using bow-tie filters, and applying iterative beam-hardening software corrections mitigate this artifact.
5In magnetic resonance imaging, what does T1 relaxation (spin-lattice relaxation) specifically measure?
A.The time required for longitudinal magnetization (Mz) to recover to approximately 63% of its equilibrium value
B.The time required for transverse magnetization (Mxy) to decay to approximately 37% of its initial amplitude
C.The time needed for precessing protons to dephase entirely due to local magnetic field inhomogeneities
D.The duration of the radiofrequency excitation pulse required to flip net magnetization into the transverse plane
Explanation: T1 relaxation (spin-lattice or longitudinal relaxation) reflects the transfer of energy from excited hydrogen nuclei (protons) back to the surrounding molecular lattice, defined as the time required for longitudinal magnetization (Mz) to regrow to 63% of its original equilibrium state (M0).
6Which combination of repetition time (TR) and echo time (TE) in a conventional spin-echo sequence produces a proton density-weighted image?
A.Short TR (< 500 ms) and short TE (< 30 ms)
B.Long TR (> 2,000 ms) and short TE (< 30 ms)
C.Long TR (> 2,000 ms) and long TE (> 80 ms)
D.Short TR (< 500 ms) and long TE (> 80 ms)
Explanation: Proton density weighting minimizes both T1 and T2 effects: a long TR (> 2,000 ms) allows nearly complete longitudinal relaxation (minimizing T1 differences), while a short TE (< 30 ms) captures the echo before substantial transverse dephasing occurs (minimizing T2 differences), leaving contrast governed by proton concentration.
7In diffusion-weighted magnetic resonance imaging (DWI), which physiological phenomenon does a low apparent diffusion coefficient (ADC) value represent in tissue?
A.Increased extracellular water mobility with rapid isotropic Brownian motion
B.Elevated perfusion velocity through dilated capillary beds
C.Restricted Brownian motion of water molecules within a dense intracellular compartment
D.Accelerated bulk fluid transport through enlarged lymphatic channels
Explanation: Diffusion-weighted imaging measures the random microscopic Brownian motion of water molecules. When cellular density increases (e.g., highly cellular tumors) or when cell swelling occurs (e.g., cytotoxic edema in acute ischemic stroke), the extracellular space shrinks, restricting water movement and resulting in low ADC values (hypointense on ADC maps, hyperintense on high b-value DWI).
8In a conventional (non-echo-planar) spin-echo sequence at 1.5 Tesla, chemical shift artifact of the first kind occurs because hydrogen protons in fat precess slower than protons in water by approximately how many Hertz, and along which axis does the spatial misregistration manifest?
A.65 Hz, manifesting exclusively along the slice-selection axis
B.140 Hz, manifesting exclusively along the phase-encoding axis
C.440 Hz, manifesting randomly across both phase and frequency axes
D.220 Hz, manifesting exclusively along the frequency-encoding axis
Explanation: The chemical shift between fat and water is 3.5 parts per million (ppm). At 1.5 T, the Larmor frequency of hydrogen is ~63.86 MHz, yielding a frequency difference of ~220 Hz (3.5 ppm × 63.86 MHz). Because spatial position along the readout direction is mapped by frequency, fat protons are misregistered by ~220 Hz along the frequency-encoding axis, creating bright and dark bands at fat-water interfaces.
9Regarding gadolinium-based contrast agents (GBCAs) and the risk of Nephrogenic Systemic Fibrosis (NSF) in patients with severe renal impairment (eGFR < 30 mL/min/1.73 m²), which structural class of agents has the highest kinetic stability and makes up most of the ACR Group II (lowest NSF risk) agents?
A.Macrocyclic ionic and non-ionic chelates (e.g., gadobutrol, gadoterate meglumine, gadoteridol)
B.Linear non-ionic chelates with flexible open-chain backbones and low thermodynamic stability (e.g., gadodiamide)
C.Linear ionic chelates with intermediate kinetic dissociation constants in tissue (e.g., gadopentetate dimeglumine)
D.Unchelated free gadolinium ion formulations with rapid transmetallation rates in biological fluid
Explanation: Macrocyclic GBCAs (such as gadobutrol, gadoterate meglumine, and gadoteridol) encage the toxic Gd3+ ion within a rigid preformed molecular ring cavity. This rigid cage provides exceptionally high thermodynamic and kinetic stability, This results in minimal dissociation and an extremely low risk of NSF. The ACR Group II list includes these macrocyclic agents and one linear agent, gadobenate dimeglumine. Group I agents (linear gadodiamide, gadopentetate, gadoversetamide) carry the highest NSF risk.
10According to the American College of Radiology (ACR) Guidance Document on MR Safe Practices, which designated MR safety zone represents the actual MR scanner room containing the static magnetic field?
A.Zone III
B.Zone IV
C.Zone II
D.Zone I
Explanation: Zone IV is the MR magnet room itself. It is strictly located within Zone III and poses immediate potential hazards due to the strong static magnetic field (missile effect, RF heating, acoustic noise). Zone IV access requires direct visual supervision by Level 2 MR personnel.

About the CMRI Radiología Exam

Independent study practice by OpenExamPrep for the certification exams of the Consejo Mexicano de Radiología e Imagen, A.C. (CMRI), a CONACEM-recognized specialty council. Certification requires three online exams: Ciencias Básicas, Radiología Clínica (Fase 1), and Razonamiento Clínico (Fase 2). The 2027 sittings are in February, May, September, and October, and fees range from MXN 3,000 to 4,300 per exam. This bank is an independent English-language MCQ study adaptation built on the CMRI subject lists, international reporting systems, and Mexican radiology norms; it is not an official translation or simulation of the Spanish-language CMRI exams.

Exam sponsor: Consejo Mexicano de Radiología e Imagen A.C. (CMRI). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

CMRI certification in Radiología e Imagen consists of three online exams taken from home. Ciencias Básicas (from the second year of residency) covers anatomy, embryology, pharmacology, physics and radiation protection, physiology, official regulations, radiologic signs, and imaging techniques. Radiología Clínica Fase 1 (R3, R4, and graduates, after passing Ciencias Básicas) covers 11 subspecialty areas. Razonamiento Clínico Fase 2 is taken in the last two months of residency or later, and may be taken the day after Fase 1. Item counts, duration, and pass marks are not published.

Time Limit

Not published

Passing Score

not-published

Exam / Certification Fees

MXN 3,000–4,300 per phase

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

  • CMRI — Calendario de exámenes 2027 · Source checked 2026-09-29Online, from-home exams: Fase 1 Radiología Clínica 11 Feb and 23 Sep 2027; Fase 2 Razonamiento Clínico 12 Feb and 24 Sep 2027; Ciencias Básicas 14 May and 29 Oct 2027; registration deadlines 4 Dec 2026, 26 Mar, 30 Jul, and 20 Aug 2027; fees by exam
  • CMRI — Tabla de costos 2026 · Source checked 2026-09-29Ciencias Básicas MXN 3,000 (2,000 conditioned or failed); Fase 1 MXN 3,000/3,500; Fase 2 MXN 3,800/4,300; added qualification MXN 7,000; recertification MXN 8,000; late certification exam MXN 9,000
  • CMRI — Reglamento de Exámenes 2026 · Source checked 2026-09-29Three online phases, their subjects (8 basic-science, 11 clinical, 10 clinical-reasoning), eligibility, first-time requirements (including ENARM), sanctions, and the MXN 1,000 cancellation or no-show penalty
  • CMRI — Guías de Estudio (bibliografías) · Source checked 2026-09-29Official bibliography lists by subject (angiology, head and neck, and other areas)
  • NOM-229-SSA1-2002 — Protección radiológica en establecimientos de diagnóstico médico con rayos X · Source checked 2026-09-29Dose limits (16.1: POE 50 mSv/year stochastic, lens 150 mSv, public 5 mSv) and protective-equipment specifications (17.4)

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

Weight not published

Física Médica, Protección Radiológica, Farmacología y Normatividad

X-ray, CT, MRI, and ultrasound physics and artifacts, dose metrics, MR safety, contrast reactions, extravasation, contrast-induced AKI, metformin, gadolinium agents, and NOM-229-SSA1-2002 dose limits and protective equipment

Weight not published

Neurorradiología y Cabeza y Cuello

Acute stroke (ASPECTS, CT perfusion), intracranial hemorrhage, brain tumors, demyelinating disease, CNS infection, deep neck spaces, and cervical nodal levels

Weight not published

Tórax y Cardiovascular

Interstitial lung disease patterns (UIP, NSIP, HP), Fleischner 2017 nodules, pulmonary embolism, acute aortic syndromes, cardiac MRI, calcium scoring, and carotid Doppler grading

Weight not published

Abdomen, Genitourinario, Ginecología, Obstetricia y Pediatría

Liver lesions and LI-RADS, pancreatic tumors and IPMN (Fukuoka 2017 / Kyoto 2024), acute abdomen, Bosniak v2019, renal and adrenal masses, PI-RADS v2.1, adnexal masses, early pregnancy failure, and midgut volvulus

Weight not published

Musculoesquelético e Imagen de la Mama

BI-RADS (5th edition and v2025 Manual), NOM-041-SSA2-2011 screening, Salter-Harris fractures, knee and shoulder MRI, and bone tumor assessment

Preparing for the CMRI Radiología Exam

What You Need to Know

  • Passing score: not-published
  • Assessment: CMRI certification in Radiología e Imagen consists of three online exams taken from home. Ciencias Básicas (from the second year of residency) covers anatomy, embryology, pharmacology, physics and radiation protection, physiology, official regulations, radiologic signs, and imaging techniques. Radiología Clínica Fase 1 (R3, R4, and graduates, after passing Ciencias Básicas) covers 11 subspecialty areas. Razonamiento Clínico Fase 2 is taken in the last two months of residency or later, and may be taken the day after Fase 1. Item counts, duration, and pass marks are not published.
  • Time limit: Not published
  • Exam / certification fees: MXN 3,000–4,300 per phase Official sources

Using Our Practice Resources

  • Work through all 105 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

CMRI Radiología: Suggested Study Strategy

1Plan by phase: physics, anatomy, and normatividad for Ciencias Básicas first, then the 11 clinical subspecialty areas for Fase 1 and integrated cases for Fase 2.
2Know the Mexican norms themselves: NOM-229-SSA1-2002 sets POE limits of 50 mSv/year (stochastic) and 150 mSv for the lens, with 0.5 mm Pb front-only or 0.25 mm wrap-around aprons; NOM-041-SSA2-2011 sets biennial screening mammography at ages 40–69.
3Master current reporting systems: LI-RADS v2018, Bosniak v2019, PI-RADS v2.1, BI-RADS (5th edition and v2025 Manual), Fleischner 2017, and the Kyoto 2024 IPMN guidelines.
4Practice calculations such as DLP, adrenal washout percentages, and Doppler stenosis grading until they are automatic.
5Review contrast safety using the ACR Manual on Contrast Media: reaction treatment, extravasation, eGFR thresholds for prophylaxis, and metformin management.

Frequently Asked Questions

How is CMRI certification in Radiología e Imagen organized?

It has three online phases. Ciencias Básicas is taken from the second year of residency. Radiología Clínica (Fase 1) is taken by R3, R4, and graduates after passing Ciencias Básicas. Razonamiento Clínico (Fase 2) is taken in the last two months of residency or later, either the day after Fase 1 or after passing it.

When are the 2027 CMRI exams and what do they cost?

The 2027 calendar lists Fase 1 on 11 February and 23 September, Fase 2 on 12 February and 24 September, and Ciencias Básicas on 14 May and 29 October. Registration closes on 4 December 2026 for the February exams. Ciencias Básicas costs MXN 3,000 the first time (MXN 2,000 for conditioned subjects or a repeat). Fase 1 costs MXN 3,000 for residents and 3,500 for graduates, and Fase 2 costs MXN 3,800 and 4,300.

What subjects do the CMRI exams cover?

Ciencias Básicas covers anatomy, embryology, pharmacology, physics and radiation protection, physiology, official regulations (normatividad), radiologic signs, and imaging techniques. Radiología Clínica covers angiology, head and neck, gastroenterology, gynecology, breast, neuroradiology, pediatrics, obstetrics, musculoskeletal, chest, and urology.

Are question counts or passing scores published?

No. The CMRI's rules, calendar, and cost table do not publish item counts, exam duration, or pass marks. Cancelling or not showing up after registration costs MXN 1,000, which is retained from the payment.

Why is this practice bank in English, and is it an official CMRI resource?

The CMRI exams are conducted in Spanish. This OpenExamPrep bank is an independent English-language MCQ study adaptation for self-assessment; it is not an official translation or simulation of the CMRI exams, and it is not affiliated with or endorsed by the CMRI or CONACEM.