Film-Screen Image Acquisition, Processing and Image Analysis

These flashcards cover key vocabulary and concepts related to film-screen image acquisition, processing, and analysis, as outlined in the lecture notes.

Darkroom

A scientific laboratory where radiography starts and ends.

Darkroom Disease

Hypersensitivity to fumes in the darkroom environment.

Main Function of Darkroom

To prevent exposure of film to white light and ionizing radiation during handling and processing.

Ideal Darkroom Setup

A room that is capable of being made completely lightproof and should have specific conditions for optimal film processing.

Dark Room Layout

The arrangement of the darkroom including size, location, and facilities needed to ensure efficiency.

Light Proofing

Exclusion of all external white light from the processing room to prevent fogging of radiographs.

Radiation Protection

Shields such as lead lining should be used in walls adjacent to the radiographic room to protect against radiation.

Film Cassettes

Devices designed to hold x-ray film and intensifying screens in close contact for proper exposure.

Safe Light

A type of light that allows visibility without exposing light-sensitive materials to harmful wavelengths.

Four Steps of Processing Films

1. Developing 2. Fixing 3. Washing 4. Drying.

Automatic Processor

A device that automates the film processing steps ensuring consistent results.

Washing Temperature Control

Maintaining specific temperatures to wash the films effectively without damaging them.

Film Speed

The sensitivity of radiographic film, relating to the time it takes to respond to an exposure.

Contrast

The difference between the darkest and lightest areas on the radiographic film.

Film Storage Conditions

Ideal conditions include 40-60% relative humidity and constant temperature for preserving film quality.

Screen Film

Film sensitive to both x-rays and light emitted from intensifying screens.

Intensifying Screen

A device that converts x-ray energy into visible light, reducing the amount of x-rays needed for exposure.

Artifacts

Unwanted marks or features on radiographics caused by various factors during processing or handling.

Safelight Illumination Test

A method to check whether the safelight used in the darkroom is safe for film handling.

Replenishment System

A mechanism that replaces lost chemicals in the processor as films are processed.

Daylight Automatic Processor

A processor that enables films to be processed without the need for a darkroom.

Exposure Time

The duration for which the film is exposed to x-rays, impacting its density and contrast.