Lesson 3 Flashcards

1
Q

Holds silver halide crystals uniformly in place, preventing clumping and ensuring consistent image quality.

A

Mechanical Support

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2
Q

Its porous nature allows developer and fixer solutions to penetrate and interact with the silver halide crystals during processing.

A

Chemical Permeability

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3
Q

Being transparent, gelatin permits light to pass through without distortion, essential for accurate image reproduction.

A

Optical Clarity

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4
Q

Enables the film to withstand bending and handling without compromising the emulsion’s integrity.

A

Flexibility

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5
Q

The properties of silver halide crystals are fundamental to the film’s performance:

A

Size and Shape
Chemical Composition
Electrical Properties
Sensitivity Specks

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6
Q

Typically around 1 micrometer (µm) in size, these crystals can be tabular (flat and triangular), cubic, octahedral, or polyhedral. The shape and size influence the film’s sensitivity and resolution.

A

Size and Shape

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7
Q

Modern radiographic films predominantly use silver bromide, constituting about 95-98% of the crystal composition, with silver iodide making up the remaining 2-5%.

A

Chemical Composition

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8
Q

Crystals possess a negatively charged surface due to the presence of halide ions (Bromide and Iodide), while the interior is positively charged (Silver).

A

Electrical Properties

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9
Q

Intentional imperfections, often introduced using silver sulfide, act as sites where latent image formation begins by attracting free silver ions during exposure.

A

Sensitivity Specks

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10
Q

are pivotal in capturing high-quality radiographic images.

A

Emulsion Layers

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11
Q

also known as the substratum or subbing layer

A

Adhesive Layer

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12
Q

is a vital component of radiographic film, situated between the emulsion and the base.

A

Adhesive layer

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13
Q

The adhesive layer maintains a firm bond between the emulsion and the base, ensuring they remain in proper contact during handling and processing. This bond is crucial for preserving the film’s structural integrity and preventing issues such as separation or peeling of the emulsion from the base.

A

Ensuring Proper Contact and Integrity

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14
Q

By securely attaching the emulsion to the base, the adhesive layer helps prevent the formation of bubbles or other distortions that could occur when the film is bent during handling or processing. This stability is particularly important when the film is wet and subjected to the heat of development processes.

A

Preventing Distortions

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15
Q

is indispensable for maintaining the cohesion and functionality of radiographic film, ensuring that the emulsion and base work together seamlessly to produce clear and accurate images.

A

Adhesive Layer

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16
Q

film serves as its foundational support, providing a stable structure onto which the emulsion layer is coated.

17
Q

Historical Evolution of Film Base Materials:

A

Glass Plates
Cellulose Nitrate
Cellulose Triacetate
Polyester

18
Q

In the early days of radiography, were used as the base material. While they offered excellent dimensional stability, their fragility and weight posed significant challenges.

A

Glass Plates

19
Q

Introduced: in the 1920s, replaced glass plates. Despite being lighter and more flexible, it was highly flammable, leading to safety concerns.

A

Cellulose Nitrate

20
Q

In the mid-1920s, emerged as a safer alternative to cellulose nitrate. It retained flexibility and was less flammable but lacked optimal dimensional stability.

A

Cellulose Triacetate

21
Q

Since the 1960s, it has been the preferred material for radiographic film bases. It offers superior strength, flexibility, and dimensional stability, ensuring consistent image quality and ease of handling.

22
Q

Key Characteristics of the Polyester Film Base:

A

Thickness
Dimensional Stability
Transparency and Tint
Coating

23
Q

Typically ranges from 150 to 300 micrometers (µm), providing a balance between durability and flexibility.

24
Q

Maintains consistent size and shape during exposure to processing chemicals and varying temperatures, preventing image distortion.

A

Dimensional Stability

25
Q

The base is uniformly transparent and often tinted with a blue dye. This tint reduces eye strain for radiologists, enhancing diagnostic efficiency and accuracy.

A

Transparency and Tint

26
Q

A special light-absorbing dye is applied to the base to prevent crossover effects, which can degrade image quality.

27
Q

The evolution of film base materials reflects ongoing advancements aimed at improving the ____

A

radiographic imaging’s safety, clarity, and reliability