This episode opens with ionization — the process by which radiation ejects orbital electrons from an atom, creating ion pairs — and then distinguishes four atomic variants relevant to nuclear medicine and radiologic science: isotopes (same protons, different neutrons), isotones (same neutrons, different protons), isobars (same atomic mass, different atomic number), and isomers (same mass and number, different energy states). Radioactivity is then defined as the spontaneous emission of particles or energy from an unstable nucleus, and the concept of radioisotopes — both naturally occurring and artificially produced — is introduced alongside the principle of radioactive decay.

Radioactive half-life (T½) is explained and applied, with clinical examples ranging from Technetium-99m to Iodine-131, illustrating how decay rates govern radionuclide utility in imaging and therapy. The episode then classifies ionizing radiation into particulate forms — alpha and beta particles — and electromagnetic forms — gamma rays and X-rays — comparing each across origin, mass, charge, penetrating ability, and biological impact. The episode closes with a comparative summary and penetration diagrams reinforcing how radiation type determines shielding requirements and clinical application.

Content is structured to support radiologic technology programs preparing for imaging coursework and ARRT certification review. This episode aligns with the Safety content category — Radiation Physics and Radiobiology subcategory — of the ARRT Radiography Examination Content Specifications.

Audio content is adapted from original instructional material developed by Professor Sanjay Arya, M.S., R.T.(R)(MR) for radiologic technology education. Part of the Radiologic Physics series — Quantum Imaging Lab.

© 2026 Quantum Imaging Lab. All rights reserved.

This episode examines the structure of the atom and its direct relevance to radiologic science. Beginning with a survey of atomic theory from early Greek philosophy through Thomson, Rutherford, Bohr, and the modern quantum mechanical model, the episode defines the atom as the smallest unit of a chemical element and identifies its two main regions: the nucleus and the electron shells. Subatomic particles — protons, neutrons, and electrons — are described in terms of charge, mass in atomic mass units, and location within the atom. Atomic number (Z) and atomic mass (A) are defined and distinguished, with emphasis on how the proton number determines elemental identity.

Electron shell organization is then covered in detail, including shell symbols (K through Q), the shell capacity formula (2n²), the octet rule, binding energy, and the balance of centripetal and centrifugal forces maintaining orbital stability. The periodic table is introduced through Mendeleev's and Moseley's contributions, with periods, groups, valence, and transition elements explained. The episode concludes with molecular and compound formation, and the two primary types of atomic bonding — ionic and covalent — with examples drawn from biologically and radiologically relevant molecules.

Content is structured to support radiologic technology programs preparing for imaging coursework and ARRT certification review. This episode aligns with the Safety content category — Radiation Physics and Radiobiology subcategory — of the ARRT Radiography Examination Content Specifications.

Audio content is adapted from original instructional material developed by Professor Sanjay Arya, M.S., R.T.(R)(MR) for radiologic technology education. Part of the Radiologic Physics series — Quantum Imaging Lab.

© 2026 Quantum Imaging Lab. All rights reserved.

This episode explores the upper gastrointestinal series and small bowel series, examining their role as radiographic structural and functional studies of the distal esophagus, stomach, and small intestine. Key pathological indications including bezoar, diverticula, hiatal hernia, gastritis, peptic ulcer disease, and gastric carcinoma are reviewed alongside their radiographic appearances and recommended contrast techniques.

The episode also covers patient preparation, body habitus considerations, and the essential projections used in UGI imaging — PA, RAO, LPO, lateral, and AP — along with small bowel series procedures including oral follow-through, enteroclysis, GI intubation, and reflux filling, with attention to timed imaging intervals and positioning landmarks.

Content is structured to support radiologic technology programs preparing for imaging coursework and ARRT certification review. This episode aligns with the Procedures content category — Thorax and Abdomen subcategory — and the Patient Care content category — Pharmacology subcategory — of the ARRT Radiography Examination Content Specifications.

Audio content is adapted from original instructional material developed by Professor Sanjay Arya, M.S., R.T.(R)(MR) for radiologic technology education. Part of the Contrast Media series — Quantum Imaging Lab.

© 2026 Quantum Imaging Lab. All rights reserved.

This introductory episode defines radiation as a form of electromagnetic energy and examines its fundamental properties, including wavelength, frequency, velocity, and the wave equation. The electromagnetic spectrum is explored alongside natural and man-made sources of ionizing radiation, with attention to background exposure levels, radon gas, cosmic radiation, and the role of medical imaging as the second highest contributor to population dose.

The episode also differentiates types of ionizing radiation — alpha, beta, gamma, and x-rays — comparing their origin, charge, mass, range, and penetrating ability in tissue. Somatic and genetic effects of radiation exposure are introduced, followed by the core principles of radiation protection: justification, optimization, and ALARA. Radiation quantities and units are reviewed, including absorbed dose, equivalent dose, and effective dose in both SI and non-SI units, alongside occupational dose limits and the cardinal rules of time, distance, and shielding.

Content is structured to support radiologic technology programs preparing for imaging coursework and ARRT certification review. This episode aligns with the Safety content category — Radiation Physics and Radiobiology subcategory — of the ARRT Radiography Examination Content Specifications.

Audio content is adapted from original instructional material developed by Professor Sanjay Arya, M.S., R.T.(R)(MR) for radiologic technology education. Part of the Radiation Biology series — Quantum Imaging Lab.

© 2026 Quantum Imaging Lab. All rights reserved.

This episode opens the Radiologic Physics series with a review of the physical laws and principles underlying radiologic science. Natural science is classified into biological and physical branches, with physics defined as the study of matter, energy, and their interactions. Matter, mass, and the three states of matter are distinguished, followed by core mechanics concepts including vector and scalar quantities, inertia, and friction. Velocity, acceleration, and Newton's three laws of motion are presented with their SI formulas and units, alongside weight, momentum, work, and power.

The episode then surveys energy in its principal forms — mechanical, chemical, electrical, nuclear, thermal, and electromagnetic — with emphasis on the law of conservation of energy and radiologic applications. Temperature scale conversions across Celsius, Fahrenheit, and Kelvin are reviewed. The episode concludes with the properties and production of X-rays as artificial electromagnetic radiation, the historical discovery by Wilhelm Roentgen in 1895, and an introduction to radiography and fluoroscopy as clinical imaging modalities.

Content is structured to support radiologic technology programs preparing for imaging coursework and ARRT certification review. This episode aligns with the Safety content category — Radiation Physics and Radiobiology subcategory — of the ARRT Radiography Examination Content Specifications.

Audio content is adapted from original instructional material developed by Professor Sanjay Arya, M.S., R.T.(R)(MR) for radiologic technology education. Part of the Radiologic Physics series — Quantum Imaging Lab.

© 2026 Quantum Imaging Lab. All rights reserved.

This episode covers the radiographic examination of the pharynx and esophagus using contrast media, also known as the Esophagram or Barium Swallow. Esophageal anatomy is reviewed in relation to structural and functional imaging, and common pathological conditions — including achalasia, GERD, Barrett's esophagus, hiatal hernia, esophageal varices, Schatzki's ring, and Zenker's diverticulum — are discussed in the context of clinical presentation and radiographic appearance.

Contrast selection, patient preparation, reflux demonstration techniques, and radiographic projections — including AP, oblique, and lateral positions — are examined with emphasis on positioning rationale, central ray placement, and image evaluation criteria.

Content is structured to support radiologic technology programs preparing for imaging coursework and ARRT certification review. This episode aligns with the Procedures content category — Thorax and Abdomen subcategory — and the Patient Care content category — Pharmacology subcategory — of the ARRT Radiography Examination Content Specifications.

Audio content is adapted from original instructional material developed by Professor Sanjay Arya, M.S., R.T.(R)(MR) for radiologic technology education. Part of the Contrast Media series — Quantum Imaging Lab.

© 2026 Quantum Imaging Lab. All rights reserved.

This episode provides a comprehensive review of the digestive system in the context of radiographic imaging. Anatomy of the alimentary canal and accessory organs is covered, including the esophagus, stomach, small intestine, and associated structures. Emphasis is placed on body habitus and its effect on the position and appearance of GI organs, stomach subdivisions, and the significance of air-fluid levels based on patient positioning.

Technical considerations for gastrointestinal contrast examinations are discussed in detail, including patient and room preparation, single versus double contrast barium sulfate techniques, iodinated contrast alternatives such as Gastrografin, exposure factors, and radiation protection principles applicable to esophagram, upper GI, and small bowel series.

Content is structured to support radiologic technology programs preparing for imaging coursework and ARRT certification review. This episode aligns with the Procedures content category — Thorax and Abdomen subcategory — and the Patient Care content category — Pharmacology subcategory — of the ARRT Radiography Examination Content Specifications.

Audio content is adapted from original instructional material developed by Professor Sanjay Arya, M.S., R.T.(R)(MR) for radiologic technology education. Part of the Contrast Media series — Quantum Imaging Lab.

© 2026 Quantum Imaging Lab. All rights reserved.

This episode examines the anatomy and physiology of the hepatobiliary system, including the liver, gallbladder, and biliary tree. Emphasis is placed on bile production, ductal anatomy, body habitus considerations, and positioning relevance in radiographic imaging. Common pathologies such as cholelithiasis, choledocholithiasis, cholecystitis, and biliary stenosis are reviewed.

Contrast agents, technical factors, and major diagnostic procedures — including OCG, IVC, PTC, intraoperative cholangiography, and ERCP — are discussed in the context of clinical imaging practice and patient safety.

Content is structured to support radiologic technology programs preparing for imaging coursework and ARRT certification review. This episode aligns with the Procedures content category — Thorax and Abdomen subcategory — and the Patient Care content category — Pharmacology subcategory — of the ARRT Radiography Examination Content Specifications.

Audio content is adapted from original instructional material developed by Professor Sanjay Arya, M.S., R.T.(R)(MR) for radiologic technology education. Part of the Contrast Media series — Quantum Imaging Lab.

© 2026 Quantum Imaging Lab. All rights reserved.

This episode examines the application of contrast media in urinary system imaging. The anatomy and physiology of the renal system are reviewed in relation to contrast distribution, filtration, and excretion.

Key procedures including intravenous urography (IVU), cystography, retrograde studies, and related fluoroscopic examinations are discussed in the context of clinical indication, technique, and image evaluation. The episode also addresses contrast selection, patient preparation, contraindications, and safety considerations specific to urinary imaging.

Content is structured to support radiologic technology programs preparing for imaging coursework and ARRT certification review. This episode aligns with the Procedures content category — Thorax and Abdomen subcategory — and the Patient Care content category — Pharmacology subcategory — of the ARRT Radiography Examination Content Specifications.

Audio content is adapted from original instructional material developed by Professor Sanjay Arya, M.S., R.T.(R)(MR) for radiologic technology education. Part of the Contrast Media series — Quantum Imaging Lab.

© 2026 Quantum Imaging Lab. All rights reserved.

This episode examines the application of contrast media in fluoroscopic imaging and differentiates between static and dynamic radiography. Key concepts including non-intensified and intensified fluoroscopy, image intensifier operation, and types of fluoroscopic systems are reviewed in the context of clinical practice.

Radiation protection principles for patients, technologists, and radiologists are outlined, along with safety considerations during fluoroscopic examinations and the professional responsibilities of the radiologic technologist.

Content is structured to support radiologic technology programs preparing for imaging coursework and ARRT certification review. This episode aligns with the Image Production — Equipment Operation and Quality Assurance — and Safety — Radiation Protection — content categories of the ARRT Radiography Examination Content Specifications.

Audio content is adapted from original instructional material developed by Professor Sanjay Arya, M.S., R.T.(R)(MR) for radiologic technology education. Part of the Contrast Media series — Quantum Imaging Lab.

© 2026 Quantum Imaging Lab. All rights reserved.