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Key Facts: Thai Radiologic Technology License Exam
60%
Minimum passing score on the written licensing examination
Professional Board of Radiological Technology examination criteria
B.E. 2542 / 2545
Governing statutes: Healing Arts Act B.E. 2542 and Royal Decree B.E. 2545
Royal Thai Government Gazette
20 mSv/year
Occupational effective dose limit recommended by ICRP / OAP Thailand
Office of Atoms for Peace (OAP) radiation safety standards
100 Questions
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Independent English-language MCQ practice bank by OpenExamPrep for the Thai Radiologic Technology Healing Arts License examination. Contains 100 high-yield questions with clinical explanations teaching radiologic physics, positioning protocols, radiation therapy, nuclear medicine, and Thai Healing Arts legal standards.
Sample Thai Radiologic Technology License Practice Questions
Try these sample questions to review concepts for the Thai Radiologic Technology License exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1When evaluating a standard posteroanterior (PA) adult chest radiograph for adequate inspiratory effort, which anatomical landmark criteria indicates sufficient lung inflation?
A.At least 10 posterior ribs are visible above the dome of the right hemidiaphragm
B.At least 8 anterior ribs are visible above the dome of the left hemidiaphragm
C.The inferior border of the scapulae completely clears the sixth thoracic vertebra
D.The carinal bifurcation projects directly over the eighth posterior thoracic rib
Explanation: A high-quality PA adult chest radiograph taken at full inspiration should demonstrate at least 10 posterior ribs (or 6 anterior ribs) above the right hemidiaphragm. Insufficient inspiration crowds bronchovascular markings and can simulate lower lobe consolidation or basilar atelectasis.
2A patient with suspected blunt thoracic trauma is referred for chest radiography. Which projection is most sensitive for detecting small volumes of pleural effusion (approximately 50 to 100 mL) that may be missed on an upright PA projection?
A.Anteroposterior (AP) supine chest projection
B.Lateral decubitus projection with the affected side down
C.Apical lordotic projection of the thorax
D.Posteroanterior (PA) chest projection taken on full expiration
Explanation: The lateral decubitus projection with the affected side dependent (down) utilizes gravity to allow pleural fluid to layer along the lateral chest wall, detecting effusions as small as 50 to 100 mL. An upright PA projection typically requires at least 175 to 200 mL of fluid to cause blunting of the lateral costophrenic angles.
3An emergency department patient cannot stand for an erect abdominal examination to rule out suspected gastrointestinal perforation. Which alternative decubitus projection should be performed to demonstrate free intraperitoneal air (pneumoperitoneum)?
A.Right lateral decubitus projection of the abdomen
B.Dorsal decubitus projection with vertical central ray
C.Left lateral decubitus projection with horizontal central ray
D.Ventral decubitus projection with horizontal central ray
Explanation: The left lateral decubitus projection with a horizontal beam is preferred because free air will rise and collect over the homogeneous soft-tissue density of the right hepatic lobe, away from gastric air in the fundus. If a right lateral decubitus were performed, free air would rise to the left side and could easily be confused with normal stomach or colonic gas.
4Which anatomical structure must be clearly included on the inferior margin of an AP supine abdominal radiograph (KUB) to ensure complete examination coverage?
A.Anterior superior iliac spines (ASIS)
B.Lesser trochanters of the proximal femora
C.Ischial tuberosities bilaterally
D.Inferior border of the pubic symphysis
Explanation: A diagnostic AP supine KUB (Kidneys, Ureters, and Bladder) radiograph must include the superior aspect of the pubic symphysis to ensure visualization of the urinary bladder and distal ureters. If the pubic symphysis is clipped, distal ureteral calculi will be missed.
5Why is an upright PA chest projection routinely included as part of an acute abdominal radiographic series (three-way abdomen)?
A.The upright chest projection is the most sensitive projection for demonstrating free air beneath the diaphragm
B.It provides anatomical confirmation that the patient has not ingested barium-containing oral contrast
C.It ensures visualization of the renal parenchyma against the lower thoracic ribs
D.It allows calculation of the cardio-thoracic ratio before intravenous contrast administration
Explanation: An upright PA chest radiograph is significantly more sensitive than an upright abdomen for detecting free intraperitoneal gas because the X-ray beam is centered higher, tangent to the thin domes of the diaphragm. Even 1 mL of free gas can be identified under the right hemidiaphragm.
6During pediatric chest radiography on an infant, why is it critical to expose the radiograph precisely at peak inspiration rather than on expiration?
A.Expiratory exposures cause severe focal blooming of the secondary radiation grid lines
B.Expiratory exposures simulate cardiomegaly and cause crowding of bronchovascular markings that mimic pulmonary consolidations
C.Inspiratory exposures elevate the thymic shadow into the anterior neck away from the mediastinum
D.Peak inspiration increases photoelectric absorption in bone, decreasing overall radiographic noise
Explanation: In infants and young children, an exposure taken during expiration causes the diaphragm to elevate dramatically, widening the cardiac silhouette (pseudocardiomegaly) and causing pulmonary vascular crowding that mimics pneumonia or diffuse atelectasis. Technologists should watch the infant's respiratory cycles and expose at peak inspiration.
7A patient presents with acute pain in the anatomical snuffbox after falling onto an outstretched hand (FOOSH). Which specialized wrist projection best profiles the scaphoid bone free of foreshortening and carpal overlap?
A.PA wrist in extreme radial deviation with vertical central ray
B.AP wrist with 45-degree medial oblique rotation
C.PA wrist in ulnar deviation with 10 to 15 degrees proximal (cephalad) central ray angulation (Stecher method)
D.Lateral wrist in neutral rotation with 20 degrees caudad central ray angulation
Explanation: The Stecher method (or PA scaphoid view with ulnar deviation) aligns the longitudinal axis of the scaphoid parallel to the image receptor and elongates it, clearing the intercarpal joint spaces. Ulnar deviation opens the lateral carpal compartment and places the scaphoid waist in profile to reveal occult hairline fractures.
8To demonstrate the carpal canal and hook of the hamate in a patient with suspected carpal tunnel syndrome, which tangential projection and central ray angle is specified by the Gaynor-Hart method?
A.Inferosuperior projection with wrist dorsiflexed 90 degrees and central ray angled 10 degrees toward the elbow
B.Superoinferior projection with wrist palmar-flexed 45 degrees and central ray perpendicular to the palm
C.Lateral projection of the wrist with 15 degrees cephalad central ray angulation entering the lunate
D.Tangential inferosuperior projection with wrist hyperextended and central ray angled 25 to 30 degrees toward the long axis of the hand
Explanation: The Gaynor-Hart tangential projection for the carpal canal requires the patient to hyperextend (dorsiflex) the wrist approximately 90 degrees while the central ray is angled 25 to 30 degrees cephalad toward the long axis of the hand (entering 1 inch distal to the base of the third metacarpal). This projects the hook of the hamate, pisiform, and carpal sulcus in cross-section without superimposition.
9In shoulder trauma radiography, which projection is crucial for distinguishing an anterior versus posterior glenohumeral dislocation without requiring the patient to abduct the injured arm?
A.Scapular Y lateral projection (PA oblique body rotation of 45 to 60 degrees)
B.AP external rotation projection of the proximal humerus
C.AP internal rotation projection of the proximal humerus
D.Tangential supraspinatus outlet projection with 45 degrees cephalad tube tilt
Explanation: The scapular Y lateral view (PA oblique projection with 45 to 60 degrees of rotation toward the affected side) profiles the scapular body, acromion, and coracoid process forming the limbs of a 'Y'. In normal anatomy, the humeral head is centered directly over the glenoid fossa (the center of the Y); an anterior dislocation projects the humeral head beneath the coracoid, while a posterior dislocation projects it beneath the acromion.
10Which radiographic projection of the shoulder provides a true axial view of the glenohumeral joint to demonstrate anterior or posterior glenoid rim fractures (Bankart lesions) when the patient can safely abduct the arm 90 degrees?
A.Transthoracic lateral projection (Lawrence method)
B.Inferosuperior axial projection (Lawrence method)
C.AP neutral rotation projection of the shoulder girdle
D.Pancoast apical projection of the superior thoracic inlet
Explanation: The inferosuperior axial projection (Lawrence method) is performed with the patient supine, the arm abducted 90 degrees, and the central ray directed horizontally through the axilla into an image receptor placed against the superior aspect of the shoulder. It demonstrates the glenohumeral joint relationship, the coracoid process pointing anteriorly, and Bankart or Hill-Sachs fractures.
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