Introduction to Radiologic and Imaging Sciences

Fundamentals of Radiologic Science

  • Radiation is energy transmitted via waves through space or a medium.
  • Energy is the capacity to create work and exists in mechanical, electrical, heat, nuclear, and electromagnetic forms.
  • Ionization is the process by which a neutral atom gains or loses an electron, thereby acquiring a net charge.
  • X-rays, also known as Roentgen rays, are human-made electromagnetic energy created when high-speed electrons are suddenly stopped.

History of Medicine and Imaging

  • Hippocrates is considered the “Father of Western Medicine”.
  • Louis Pasteur discovered the role of germs in disease processes.
  • Wilhelm C. Röntgen discovered X-rays on November 8, 1895; he received the Nobel Prize in Physics in 1901.
  • The first medical radiograph was an image of Röntgen’s wife’s hand.

Diagnostic and Therapeutic Modalities

  • Radiography: Uses ionizing electromagnetic energy (X-rays) to create medical images.
  • Diagnostic Medical Sonography: Uses non-ionizing mechanical energy in the form of high-frequency sound energy.
  • Magnetic Resonance Imaging (MRI): Uses high-strength magnetic fields and radio waves; this is a non-ionizing modality.
  • CT Scanning: Uses X-ray energy and sophisticated software to create hundreds of views and cross-sectional images.
  • Nuclear Medicine: Utilizes nuclear energy from radioactive isotopes (gamma radiation) and radiopharmaceuticals to assess physiological functioning.
  • Cardiovascular Interventional Technology (CVIT): Visualizes blood vessels and heart anatomy using catheters and X-ray contrast material in sterile angiography labs.
  • Radiation Therapy: Employs very-high-energy ionizing radiation to treat malignant tumors; radiation therapists work with medical dosimetrists to administer treatment plans.

Professional Regulation and Health Careers

  • American Registry of Radiologic Technologists (ARRT): Founded in 1922 and headquartered in Minneapolis, MN; provides credentialing for 15 disciplines through primary and post-primary pathways.
  • American Society of Radiologic Technologists (ASRT): Developed the Clinical Practice Standards for Radiography.
  • Career Paths: Opportunities include clinical practice (starting with R.T.(R)(ARRT)), radiology administration (CRA), education, research, and commercial sales or biomedical engineering.
  • Health Care Team: Includes MD (Medical Doctor), DO (Doctor of Osteopathy), Nurses, and allied health personnel.