Introduction to Imaging and Radiologic Sciences - Vocabulary Flashcards

Chapter Objectives

• Define Radiography
• Define Ionization
• Explain the potential damage of xrays
• Define Radiologic Technology
• List which modalities use ionic radiation and which use non-ionic radiation
• Explain how xrays are produced
• Understand how William Crooke and Crooke’s tube played large part in xray discovery
• Explain how Wilhelm Roentgen discovered xrays
• Be able to share who the first xray patient was, and what body part was xrayed

Radiography

• Definition: Making of records (radiographs) of internal structures by passing x-rays through the body to create an image.
• Example metadata (as shown in the transcript):
  • IM: $3$
  • Rows: $2500$
  • Columns: $2048$
  • Sex: F
  • Study Date: $05/07/2008$
  • Study Time: $12:13:34.357$
• Note: This metadata illustrates typical patient imaging data accompanying radiographs.

Ionization

• Definition: Occurs when energy strikes an atom, knocking out an electron.
• Key idea: Ionization can alter atomic structure and cellular chemistry when exposed to high-energy radiation such as xrays.

Ionization and Safety in Radiography

• Xrays have the ability to ionize atoms due to their high energy.
• In the process, xrays can change the composition of cells, causing disruption.
• DMIR (the program referenced) educates students to use xrays safely to minimize such damage.

Radiologic Technology: Overview

• Definition: The branch of health sciences dealing with radiant energy to diagnose or treat disease by both ionizing and nonionizing radiation.
• Ionizing Radiation XRAY: Uses electromagnetic energy radiation.
• Radiation Therapy: High-energy xrays used to eliminate cancer cells.
• Nuclear Medicine: Uses substances emitting gamma radiation.
• CT (Computed Tomography): A radiologic imaging modality that reconstructs body sections from X-ray data.
• Non-Ionizing Radiation MRI: Uses radio waves, which are a form of electromagnetic radiation.
• Ultrasound: Uses sound waves (not electromagnetic radiation).
• Summary: Radiologic technology spans both ionizing and nonionizing modalities and includes a variety of diagnostic and therapeutic tools.

How are xrays produced?

• Mechanism: Sudden deceleration of electrons.
• Key components:
  • Rotor
  • Stator
  • Anode stem
  • Tungsten/menium anode disk
  • Anode (+)
  • Cathode (-)
  • Glass envelope
  • Filament in focusing cup

Basic XRAY History – Discovery

• William Crookes invented a tube composed of a cathode and anode attached to an electrical supply.
• The tube was an early version of fluorescent light or a modern “flashlight.”
• During experiments (1870), Crookes’ tube actually produced xrays, but he did not realize it at the time.

Wilhelm Roentgen

• Roentgen experimented with a covered Crookes tube.
• Photographic plates in the room started glowing, which indicated invisible rays were being emitted from the Crookes tube.
• Conclusion: Invisible rays being emitted from Crookes tube; these rays were named X-rays.

November 8, 1895 – First X-ray

• Date: November 8, 1895
• Subject: Bertha Roentgen
• Image: Hand with wedding ring
• Significance: First documented X-ray photograph and a pivotal moment in medical imaging.

Wilhelm Roentgen: Life and Impact

• Lived: 1845–1923
• Roentgen’s experiments and findings are still represented in current xrays today without significant changes in the way xrays are produced.

First X-ray Patient and Body Part

• The first documented X-ray patient was Bertha Roentgen.
• Body part X-rayed: Hand (hand with wedding ring).

Quick Connections to Foundational Concepts

• Radiography relies on ionizing electromagnetic radiation to create images of internal structures.
• Ionization is a fundamental mechanism by which xrays interact with matter, potentially causing cellular changes.
• Safety and ethics in radiologic technology emphasize minimizing unnecessary exposure while obtaining diagnostic information.
• The historical development (Crookes tube → Roentgen’s experiments → first X-ray) underpins modern X-ray production and imaging practices.

Practical and Ethical Implications

• Balancing diagnostic benefit against potential radiation-induced risk is essential in clinical practice.
• Understanding both ionizing and nonionizing modalities informs modality selection for patient safety and diagnostic value.
• Historical context emphasizes the importance of rigorous safety standards and continuous advancement in imaging technology.

Formulas and Key Numbers (illustrative)

• None of the core concepts in the transcript require mathematical formulas, but important numerical references include:
  • $IM = 3$
  • $Rows = 2500$
  • $Columns = 2048$
  • $StudyDate = 05/07/2008$
  • $StudyTime = 12:13:34.357$
• When discussing exposure, dose, and imaging physics, refer to established radiology safety guidelines and protocols in your course materials.