100+ Free Radiology Technology Qualification (China) Practice Questions

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2026 Statistics

Key Facts: Radiology Technology Qualification (China) Exam

360 Minutes

Total CBT Examination Duration (4 papers x 90 minutes)

National Health Commission Talent Exchange Center (21wecan)

60 / 100

Passing Standard on All 4 Subject Papers

National Health Professional Qualification Testing Rules

2-Year Rolling

Score Management Cycle (2年为一个周期的滚动管理)

China National Health Professional Qualification Regulations

104 / 206 / 376

National Exam Codes (技士 / 技师 / 主管技师)

NHC Official Professional Specialty Directory

Annual (April)

National Testing Schedule Frequency

China Health Talent Portal (www.21wecan.com)

GB 18871 / NHC

Statutory Radiation Protection & Clinical Guidelines

National Health Commission of the People's Republic of China

The National Radiology Technology Qualification Examination is China's official title licensing examination for medical imaging professionals. Administered by 21wecan under the National Health Commission, candidates must pass all 4 subject papers (Basic Knowledge, Related Professional Knowledge, Professional Knowledge, and Professional Practice Ability) with scores of 60/100 or higher within a rolling 2-year window. This bank provides 100 verified practice questions with dual-language Chinese radiological terminology.

Sample Radiology Technology Qualification (China) Practice Questions

Try these sample questions to test your Radiology Technology Qualification (China) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In diagnostic X-ray tube physics, which interaction mechanism between high-speed incident electrons and the tungsten target nucleus generates the continuous X-ray spectrum (连续X射线谱)?

A.Bremsstrahlung radiation (韧致辐射)

B.Characteristic radiation (特征辐射)

C.Photoelectric absorption (光电吸收)

D.Coherent Rayleigh scattering (相干瑞利散射)

Explanation: Bremsstrahlung radiation (韧致辐射, braking radiation) occurs when high-speed cathode projectile electrons penetrate the electron cloud of target tungsten atoms, are decelerated and deflected by the positive nuclear electrostatic field, and emit their lost kinetic energy as continuous X-ray photons spanning from zero up to the peak tube voltage (kVp).

2For a standard tungsten target (钨靶, atomic number Z = 74, K-shell binding energy = 69.5 keV), what is the minimum tube voltage (管电压) required to generate K-characteristic X-rays (K系特征X射线)?

A.45.0 kV

B.55.5 kV

C.69.5 kV

D.120.0 kV

Explanation: To produce K-characteristic radiation, the incident projectile electron must possess kinetic energy equal to or greater than the binding energy of the target atom's K-shell electron. For tungsten (Z=74), the K-shell binding energy is approximately 69.5 keV; therefore, the tube voltage must be set to at least 69.5 kV (practically >= 70 kVp).

3According to the Anode Heel Effect (阳极效应), how is the X-ray beam intensity distributed along the anode-cathode axis in diagnostic radiography?

A.Intensity is significantly higher on the anode side (阳极侧) due to forward electron emission.

B.Intensity is significantly higher on the cathode side (阴极侧) because X-rays emitted toward the anode undergo greater self-absorption in the target heel.

C.Intensity is strictly uniform across the entire field due to the collimator flattening filter.

D.Intensity peaks at the exact central ray and drops off symmetrically toward both the anode and cathode ends.

Explanation: The Anode Heel Effect (阳极效应) occurs because X-rays generated at a finite depth within the angled anode target must travel through a thicker path of target material toward the anode side, resulting in greater self-attenuation. Consequently, the beam intensity is higher on the cathode side (阴极侧) and lower on the anode side (阳极侧). In clinical practice, thicker anatomical body parts (e.g., abdomen, thoracic spine) should be aligned with the cathode side.

4In medical diagnostic imaging (energy range 20–150 keV), what is the relationship between the probability of photoelectric absorption (光电效应发生概率 tau) and the atomic number of the absorber (Z) as well as the incident photon energy (E)?

A.tau is approximately proportional to Z^3 / E^3

B.tau is directly proportional to Z and independent of E

C.tau is inversely proportional to Z^2 and proportional to E^2

D.tau is proportional to electron density (rho_e) and inversely proportional to E

Explanation: The mass photoelectric attenuation coefficient is approximately proportional to the cube of the absorber atomic number (Z^3) and inversely proportional to the cube of the incident photon energy (1/E^3), expressed as tau/rho proportional to Z^3 / E^3. This steep Z^3 dependence is the physical basis for high tissue contrast between bone (Z_eff ~ 13.8) and soft tissue (Z_eff ~ 7.4), as well as contrast agents (Iodine Z=53, Barium Z=56).

5Which interaction between diagnostic X-ray photons and human tissue is primarily responsible for scattered radiation (散射线) that degrades radiographic image contrast and constitutes the primary source of occupational radiation exposure?

A.Compton scattering (康普顿散射)

B.Photoelectric absorption (光电效应)

C.Pair production (电子对效应)

D.Photodisintegration (光核反应)

Explanation: Compton scattering (康普顿散射, incoherent scattering) involves an incident photon interacting with an outer-shell atomic electron, ejecting a Compton recoil electron and deflecting a scattered photon with reduced energy. Compton scatter creates background fog on the detector (reducing image contrast) and travels in all directions, representing the predominant source of occupational radiation exposure to radiological technologists in fluoroscopy and interventional suites.

6What is the threshold incident photon energy required for pair production (电子对效应) to occur when interacting with the nuclear electrostatic field of an absorber atom?

A.0.511 MeV

B.1.022 MeV

C.2.044 MeV

D.10.0 MeV

Explanation: Pair production (电子对效应) occurs when a high-energy photon interacts with the electric field of an atomic nucleus and transforms into an electron-positron pair. According to Einstein's mass-energy equivalence formula (E = mc^2), the rest mass of an electron is 0.511 MeV; therefore, the creation of a positron-electron pair requires a minimum threshold energy of 2 * 0.511 MeV = 1.022 MeV.

7If a monoenergetic X-ray beam passes through a shielding material with a linear attenuation coefficient (线性衰减系数 mu) of 0.693 cm^-1, what is the Half-Value Layer (半值层, HVL) of this shielding material?

A.0.50 cm

B.1.00 cm

C.1.44 cm

D.2.00 cm

Explanation: The relationship between Half-Value Layer (HVL) and linear attenuation coefficient (mu) for a monoenergetic beam is given by HVL = ln(2) / mu = 0.693 / mu. Substituting mu = 0.693 cm^-1 yields HVL = 0.693 / 0.693 cm^-1 = 1.00 cm.

8Which of the following statements correctly distinguishes the linear attenuation coefficient (mu) from the mass attenuation coefficient (mu / rho)?

A.The linear attenuation coefficient (mu) is independent of the physical density of the medium, whereas the mass attenuation coefficient varies with physical state.

B.The mass attenuation coefficient (mu / rho) normalizes attenuation by density (rho), making it independent of the material's physical state (e.g., ice, liquid water, or steam).

C.The mass attenuation coefficient has units of cm^-1, while the linear attenuation coefficient has units of cm^2/g.

D.The linear attenuation coefficient is used exclusively for particulate radiation, while the mass attenuation coefficient applies only to electromagnetic waves.

Explanation: The linear attenuation coefficient (mu, cm^-1) represents photon attenuation per unit linear thickness and depends directly on the physical density (packing of atoms) of the material. The mass attenuation coefficient (mu/rho, cm^2/g) divides mu by physical density (rho), reflecting the probability of interaction per unit mass, making it independent of the physical state (e.g., liquid water, solid ice, or water vapor share the identical mass attenuation coefficient for a given photon energy).

9What is the official SI unit and physical definition for absorbed dose (吸收剂量, D) of ionizing radiation?

A.Gray (Gy), defined as 1 Joule of energy deposited per kilogram of irradiated matter (1 J/kg)

B.Sievert (Sv), defined as biological damage per kilogram normalized by tissue weighting factors

C.Coulomb per kilogram (C/kg), defined as electric charge liberated in air per unit mass

D.Becquerel (Bq), defined as one nuclear disintegration per second

Explanation: Absorbed dose (吸收剂量, D) is the quotient of the mean energy (dE) imparted by ionizing radiation to matter in a volume element of mass (dm): D = dE / dm. Its official International System of Units (SI) unit is the Gray (Gy), where 1 Gy = 1 J/kg (equivalent to 100 rad in historical units).

10Under ICRP Publication 103 and China GB 18871-2002, what is the Radiation Weighting Factor (辐射权重因子, w_R) assigned to diagnostic X-ray photons and gamma rays?

A.1

B.2

C.5

D.20

Explanation: The Radiation Weighting Factor (辐射权重因子, w_R) reflects the relative biological effectiveness of different radiation types in inducing stochastic health effects. Low linear energy transfer (low-LET) radiations, including X-rays, gamma rays, and electrons/positrons of all energies, have a radiation weighting factor w_R = 1. High-LET alpha particles and heavy recoil nuclei have w_R = 20, while protons have w_R = 2.

About the Radiology Technology Qualification (China) Exam

The China National Health Professional Qualification Examination for Radiology Technology (全国卫生专业技术资格考试 - 放射医学技术) is the statutory professional qualification and title certification examination for medical imaging technologists and radiologic practitioners across the People's Republic of China. Administered by the National Health Commission Talent Exchange Center (21wecan), passing the examination certifies technical competence in radiation physics, radiation protection, diagnostic X-ray, CT, MRI, DSA, ultrasound, digital post-processing, clinical protocols, contrast media safety, and imaging department quality assurance.

Assessment

Paper 1: 基础知识 (Basic Knowledge, 100 MCQs, 90 min); Paper 2: 相关专业知识 (Related Professional Knowledge, 100 MCQs, 90 min); Paper 3: 专业知识 (Professional Knowledge, 100 MCQs, 90 min); Paper 4: 专业实践能力 (Professional Practice Ability, 100 MCQs, 90 min); total 360 minutes CBT across 1 day.

Time Limit

360 minutes total (90 minutes per subject paper across 4 papers)

Passing Score

60 / 100 points on each of the 4 subject papers within a 2-year rolling window

Exam Fee

Set provincially; Hunan's 2026 notice charges RMB 70 per subject (National Health Commission Talent Exchange Center (国家卫生健康委人才交流服务中心 / 21wecan) & Ministry of Human Resources and Social Security)

Radiology Technology Qualification (China) Exam Content Outline

20%

Radiation Physics & Radiation Protection (放射物理与辐射防护)

Evaluates fundamental atomic and radiation physics, interaction of ionizing radiation with biological tissues, and national radiation protection standards: atomic energy levels, continuous bremsstrahlung and characteristic X-ray spectra, tube voltage kVp and filtration influence on beam quality, photoelectric absorption and Compton scattering probability formulas, linear/mass attenuation coefficients, half-value layer (HVL), radiation dosimetry (absorbed dose Gy, equivalent dose Sv, effective dose Sv, air kerma, exposure C/kg), deterministic vs stochastic radiation effects, ICRP/GB 18871 protection principles (justification, optimization ALARA, dose limits), time-distance-shielding calculations (inverse square law, lead equivalence), and statutory occupational (20 mSv/yr) and public (1 mSv/yr) dose limits.

30%

Medical Imaging Equipment & Principles (医学影像设备学与成像原理)

Covers engineering principles and hardware architecture of diagnostic imaging modalities: diagnostic X-ray tubes (rotating anode, tungsten-rhenium target, focal spot sizes, line-focus principle, anode heel effect, thermal ratings), high-voltage generators, anti-scatter grids (grid ratio, grid frequency, cutoff artifacts), flat panel detectors (indirect CsI:Tl + a-Si TFT vs direct a-Se + TFT), CR photostimulable phosphor plates (BaFBr:Eu2+); multi-detector CT (MDCT) hardware, slip rings, solid-state scintillation detectors, photon-counting detectors, bowtie filters, CT number (Hounsfield Unit) calibration formula, window width (WW) and window level (WL) image display; MRI hardware (superconducting magnets, shim coils, gradient coils, RF coils, SAR limits), NMR resonance principles, T1/T2 relaxation times, pulse sequence physics (SE, FSE/TSE, GRE, STIR, FLAIR, DWI, MRA, PWI, MRS); DSA digital subtraction modes (temporal, energy, hybrid, roadmapping); ultrasound transducer piezoelectric effect and Doppler physics; and nuclear medicine gamma camera, SPECT, and PET-CT coincidence detection.

25%

Radiographic Positioning & Image Processing (常规摄影体位与影像处理技术)

Assesses standard anatomical positioning techniques, radiographic criteria, and digital image processing: cranial radiography (Caldwell 23° caudal, Waters 37° chin extension, Towne 30° caudal to OML, Rhese optic foramen 53° rotation), chest radiography (PA upright deep inspiration, lateral, decubitus, apical lordotic), cervical spine (AP, lateral, 45° oblique intervertebral foramina, open-mouth dens C1-C2), thoracic/lumbar spine (AP, lateral, 45° lumbar oblique Scottie dog), extremities and pelvic views (Grashey glenoid, Judet acetabulum, sunrise patellar, ankle mortise 15-20° internal rotation); digital image post-processing algorithms (LUT, histogram equalization, unsharp mask edge enhancement, dynamic range compression DRC, multi-planar reconstruction MPR, curved planar reformation CPR, maximum/minimum intensity projection MIP/MinIP, volume rendering VR); and image quality evaluation metrics (spatial resolution lp/mm, MTF, DQE, SNR, CNR, quantum noise, DICOM 3.0 standard, and display monitor GSDF calibration).

25%

Clinical Imaging Examination Protocols & Quality Management (临床检查规范、对比剂安全与质量管理)

Focuses on advanced clinical examination protocols, contrast media safety, artifact recognition, and department quality assurance: acute stroke CT protocols (non-contrast CT, CTA, CTP ASPECTS score), high-resolution chest CT (HRCT), multi-phase dynamic abdominal CT (hepatic arterial phase 25-30s, portal venous phase 60-70s, delayed phase 120-180s), coronary CTA (CCTA heart rate < 65-70 bpm, beta-blockers, nitroglycerin, prospective ECG triggering vs retrospective ECG gating), CTPA pulmonary embolism protocol (high flow rate, bolus tracking, shallow breathing); contrast media pharmacology (iodinated non-ionic monomers/dimers, gadolinium chelates), contrast extravasation management, acute anaphylactoid reaction emergency interventions (epinephrine 1:1000 IM, airway management), contrast-induced nephropathy (CIN / PC-AKI) hydration protocols (0.9% saline 1-1.5 mL/kg/h); MRI artifact identification and mitigation (phase-encoding motion ghosting, aliasing wrap-around, chemical shift 1st/2nd kind, magnetic susceptibility, magic angle effect); and imaging department QA/QC procedures (X-ray tube output and timer accuracy, CT water phantom 0 +/- 4 HU accuracy, noise, CTDIvol and DLP dose reference levels DRL, MRI SNR and geometric linearity checks).

How to Pass the Radiology Technology Qualification (China) Exam

What You Need to Know

Passing score: 60 / 100 points on each of the 4 subject papers within a 2-year rolling window
Assessment: Paper 1: 基础知识 (Basic Knowledge, 100 MCQs, 90 min); Paper 2: 相关专业知识 (Related Professional Knowledge, 100 MCQs, 90 min); Paper 3: 专业知识 (Professional Knowledge, 100 MCQs, 90 min); Paper 4: 专业实践能力 (Professional Practice Ability, 100 MCQs, 90 min); total 360 minutes CBT across 1 day.
Time limit: 360 minutes total (90 minutes per subject paper across 4 papers)
Exam fee: Set provincially; Hunan's 2026 notice charges RMB 70 per subject

Keys to Passing

Work through all 100 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

Radiology Technology Qualification (China) Study Tips from Top Performers

1Master Radiation Physics & Interaction Formulas: Memorize the mathematical relationships for photoelectric absorption (proportional to Z^3 / E^3) and Compton scattering (independent of Z, proportional to electron density rho_e), and commit radiation units (Gy, Sv, C/kg) and GB 18871 statutory dose limits (20 mSv/yr occupational, 1 mSv/yr public) to memory.

2Understand CT Parameters & HU Calculations: Master the CT number formula (HU = 1000 * (mu_tissue - mu_water) / mu_water), understand the physical impact of pitch (Pitch = table feed per rotation / total collimation width; Pitch > 1 reduces patient dose and scan time but increases effective slice profile broadening), and memorize standard tissue HU values.

3Master MRI Sequences & Tissue Contrast: Internalize how TR and TE determine T1WI (short TR, short TE), T2WI (long TR, long TE), and PDWI (long TR, short TE), and understand specialized sequences: STIR for fat nulling (TI = 0.693 * T1_fat), FLAIR for CSF nulling, and DWI for acute ischemic stroke (hyperintense on DWI, low ADC value).

4Memorize Standard Radiographic Projection Angles: Commit key cranial and skeletal projection angles to memory: Caldwell (PA 23° caudal), Waters (chin extended 37°), Towne (30° caudal to OML / 37° to IOML), Rhese optic foramen (53° head rotation, 12° caudal), cervical spine oblique (45° for intervertebral foramina), and ankle mortise (15-20° internal rotation).

5Review Contrast Safety & Emergency Protocols: Know the standard emergency treatment for severe iodinated contrast anaphylactoid reactions (immediate intramuscular epinephrine 1:1000, 0.3–0.5 mg in anterolateral thigh), contrast-induced nephropathy prevention (intravenous 0.9% saline hydration 1.0–1.5 mL/kg/h), and gadolinium NSF risks in patients with eGFR < 30 mL/min/1.73m2.

6Practice Artifact Recognition and Mitigation: Understand how to eliminate MRI motion artifacts (swap phase-encoding direction, respiratory gating), wrap-around aliasing (increase phase FOV / oversampling), chemical shift artifacts (increase receiver bandwidth), and CT metal streak artifacts (iterative MAR algorithms, energy spectrum monochromatic imaging).

Frequently Asked Questions

What is the China National Radiology Technology Qualification Examination and what titles does it confer?

The National Health Professional Qualification Examination for Radiology Technology (全国卫生专业技术资格考试 - 放射医学技术) is China's official statutory qualification and title certification examination for medical imaging professionals. Administered by the National Health Commission Talent Exchange Center (21wecan), the examination confers professional titles across three distinct career tiers: Junior Assistant Radiologic Technologist (放射医学技士, Code 104), Junior Radiologic Technologist (放射医学技师, Code 206), and Intermediate Supervisor Radiologic Technologist (放射医学技术主管技师, Code 376).

What is the examination structure, duration, and score validity period?

The examination is administered nationwide as a computer-based test (CBT / 人机对话) consisting of four subject papers: Basic Knowledge (基础知识), Related Professional Knowledge (相关专业知识), Professional Knowledge (专业知识), and Professional Practice Ability (专业实践能力). Each paper contains 100 multiple-choice questions with a time limit of 90 minutes (360 minutes total). Scores are managed under a 2-year rolling cycle (2年为一个周期的滚动管理), meaning candidates must pass all four subjects with a score of 60/100 or above within two consecutive examination years to obtain certification.

What educational qualifications and work experience prerequisites are required?

Candidates must hold an accredited educational diploma or degree in Medical Imaging Technology (医学影像技术专业). For the Junior Assistant level (技士 104), secondary vocational (中专) or junior college (大专) graduates can sit for the exam. For the Junior Technologist level (技师 206), requirements range from bachelor's graduates (after 1 year of clinical internship) to junior college graduates (after 1 year as assistant technologist) or secondary vocational graduates (after 5 years as assistant technologist). For the Intermediate Supervisor level (主管技师 376), bachelor's degree holders require 4 years as junior technologist, master's degree holders require 2 years, and doctoral graduates can register directly.

When is the examination held and how do candidates register?

The national examination is held annually in April. Online registration opens in November or December of the preceding year through the official 21wecan portal (中国卫生人才网, https://www.21wecan.com). Candidates submit application materials online followed by on-site or institutional credential verification by local health administrative bodies.

Why is this OpenExamPrep practice bank presented with bilingual terminology?

While the official computerized exam in China is administered in Simplified Chinese, this practice module provides 100 rigorous questions with authentic dual-language terminology in parentheses (e.g., 放射物理, 辐射防护, 螺距, 射频脉冲, 弥散加权成像, 窗宽窗位, 对比剂肾病). This ensures comprehensive conceptual mastery for domestic exam candidates, bilingual healthcare professionals, international clinical fellows, and biomedical imaging engineers.

100+ Free Radiology Technology Qualification (China) Practice Questions

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