Radiography 1

1

Where should the front edge of a bitewing radiograph be aligned?

1

Which type of bitewing radiography is more commonly used?

1

In a bitewing radiograph, the film should be positioned ( at 90°, at 45°, at 30° ) to the occlusal surfaces of the teeth / central x-ray beam.

1

When may a bitewing radiograph be prescribed?

1

What % of radiographs must be of excellent quality, with no errors in exposure, positioning or processing?

1

What colour of envelope is used to request a radiograph in the X-ray department?

1

A _______ envelope is used to request a radiograph on clinics

1

What size of film is used when taking anterior periapical radiographs?

1

Size 4 film is used for what type of radiograph?

1

What size of film is used when taking posterior periapical radiographs?

1

Posterior periapicals and Bitewing radiographs are both taken using the same size of film.

1

The white side of the X-ray film faces ( towards, away from ) the X-ray tube.

1

Radiographs should be prescribed to screen for disease.

1

Select the correct indications for use of a peri-apical radiograph

1

Which type of X-ray film holder is used when using the bisecting angle technique?

1

The paralleling periapical technique is ( reproducible, not reproducible ) since the X-ray film and tube are held in place with a holder.

1

In the paralleling periapical technique, the tooth and sensor are in contact.

1

In both the ideal and parallelling periapical technique, which two things are parallel?

1

In the ideal technique, the tooth and sensor are in contact.

1

The best way to describe the bisecting angle technique is...

1

The angle between which two features is bisected to reach the bisected angle?

1

Where is the central X-ray beam directed in the bisecting angle technique?

1

What does ALARP stand for?

1

Poor contrast may be as a result of...

1

Shorter roots can be caused by ( too much, too little ) vertical angulation.

1

An overexposed image is darker than an optimally exposed image.

1

Which side of the sensor faces the X-ray tube?

1

Which side of the sensor faces away from the X-ray tube?

1

For peri-apical radiographs, the embossed dot should aim towards the...

1

For bite wing radiographs, the embossed dot should aim towards the...

1

What type of film is used for extra oral radiography?

1

What type of film is used for intra oral radiography?

1

Direct film is primarly responsive to

1

Indirect film is primarly sensitive to

1

Indirect film does not have embossed dot therefore L+R markers are used in the casette.

1

Which of these are components used in intensifying screens?

1

Intensifying screens reduce patient dose but consequently produce a lower resolution image.

1

If a direct film is placed the wrong way round, there is no way of telling that an error has been made.

1

Label the image of the direct X-ray film

Protective gelatin layer

Emulsion (silver halide)

Adhesive

Plastic base

1

When X-ray photons strike the silver halide emulsion of the film, what happens to the silver halide emulsion?

1

When X-ray photons hit the silver halide emulsion, does this form the visible or latent image?

1

The embossed dot should face toward the operator and x-ray tube.

1

In a CCD X-rays hit the layer above the matrix/array and are converted to photons. This creates a which represents the image. This is transmitted as an voltage then converted by an analogue-digital converter to the digital image.

1

Instead of film, what do PSPP systems use?

1

For a PSPP system, the barium phosphor layer absorbs the X-ray photons and stores them (X-rays not by patient). The image plate is then placed in a laser reader and this causes the stored X-rays to be released as light. A tube then detects this light energy and converts it into a voltage which is then interpreted by a computer and displayed as a digital image.

1

Select the disadvantages of digital film

1

Select the advantages of digital film

1

Digital X-ray processing:

1. ( Analogue, Digital ) voltage converted to numerical ( digital, analogue ) signal
2. Each pixel given x,y coordinate and ( number, hash )
3. The computer then allocates the number a shade of ( grey, the visible spectrum ) scale

1

A number 0 given to a pixel represents a black shade on the grey scale. What does this mean about X-ray attenuation of the patient?

1

A number 255 given to a pixel represents a white shade on the grey scale. What does this mean about X-ray attenuation of the patient?

1

Which factors affect the final resolution and size of a digital X-ray image?

1

Put in the correct order the processing of X-ray film

1. ❌
2. ❌
3. ❌

Development

Fixation

Washing

1

During development of X-ray film, sensitised silver halide ions are reduced to black metallic silver. What part of the image does this produce?

1

Too long development of X-ray film leads to an image that is...

1

What is the name of the active ingredient in the developing solution used to develop X-ray film?

1

During fixation of the X-ray film image, what substance is used to remove unsensitised silver halide ions?

1

The removal of unsensitised silver halide ions results in which parts of the image?

1

The time taken to clear unsensitised silver halide ions is known as the...

1

The X-ray film is fixed for ........ the clearing time

1

The fixation solution is alkaline and thus contamination with the alkaline developer solution is not a problem.

1

The X-ray film emulsion is ........... by aliminium chloride.

1

After fixation, X-rays films are washed to remove residual chemicals. What chemical is used to wash them?

1

In manual processing there is sometimes an extra washing stage - when is this completed?

Part 1 Radiography Quiz containing questions from Introduction to Intra-oral Radiography and Radiographic films/processing.

Radiography 1

Radiography 1

Where should the front edge of a bitewing radiograph be aligned?

Which type of bitewing radiography is more commonly used?

In a bitewing radiograph, the film should be positioned at 90° at 45° at 30°( at 90°, at 45°, at 30° ) to the occlusal surfaces of the teeth / central x-ray beam.

When may a bitewing radiograph be prescribed?

What % of radiographs must be of excellent quality, with no errors in exposure, positioning or processing?

What colour of envelope is used to request a radiograph in the X-ray department?

A _______ envelope is used to request a radiograph on clinics

What size of film is used when taking anterior periapical radiographs?

Size 4 film is used for what type of radiograph?

What size of film is used when taking posterior periapical radiographs?

Posterior periapicals and Bitewing radiographs are both taken using the same size of film.

The white side of the X-ray film faces towards away from( towards, away from ) the X-ray tube.

Radiographs should be prescribed to screen for disease.

Select the correct indications for use of a peri-apical radiograph

Which type of X-ray film holder is used when using the bisecting angle technique?

The paralleling periapical technique is reproducible not reproducible( reproducible, not reproducible ) since the X-ray film and tube are held in place with a holder.

In the paralleling periapical technique, the tooth and sensor are in contact.

In both the ideal and parallelling periapical technique, which two things are parallel?

In the ideal technique, the tooth and sensor are in contact.

In a bitewing radiograph, the film should be positioned ( at 90°, at 45°, at 30° ) to the occlusal surfaces of the teeth / central x-ray beam.

The white side of the X-ray film faces ( towards, away from ) the X-ray tube.

The paralleling periapical technique is ( reproducible, not reproducible ) since the X-ray film and tube are held in place with a holder.

Shorter roots can be caused by ( too much, too little ) vertical angulation.