اجهزة طبية

In speech audiometry, what is the speech recognition threshold (SRT)?

• The maximum volume at which speech is understood

• The lowest volume at which speech can be correctly identified

• The range of frequencies a person can hear

• The ability to hear speech in noisy environments

What is the typical duration of an ERG signal?

• 100 ms

• 200 ms

• 500 ms

• 1 second

In which situation is an indirect ophthalmoscope preferred over a direct ophthalmoscope?

• Examining the optic disc in a well-lit room

• Viewing the peripheral retina in a patient with a cataract

• Evaluating the corneal surface for abrasions

• Measuring intraocular pressure

What principle enables optical fibers to transmit light in flexible endoscopes?

• Diffraction

• Reflection

• Total internal reflection

• Refraction

Which of the following is NOT a type of endoscopy?

• Colonoscopy

• Laryngoscopy

• Arthroscopy

• Neuroscopy

Which of the following is a disadvantage of using a direct ophthalmoscope?

• It does not require pupil dilation

• It provides a limited field of view

• It is more expensive than an indirect ophthalmoscope

• It inverts the retinal image

Which type of electrode is commonly used for ERG recordings?

• Gold foil electrode

• Contact lens electrode

• Subdermal needle electrode

• ECG electrode

What is the primary advantage of fiberoptic bundles in endoscopy?

• High durability

• Transmission of light even when bent

• Superior image resolution compared to lenses

• Compact design

The a-wave in the ERG waveform primarily reflects the condition of:

• Ganglion cells

• Cone and rod photoreceptors

• Inner retinal layers

• Bipolar cells

What is a key advantage of capsule endoscopy?

• Real-time video feedback

• Minimally invasive imaging of the small intestine

• Ability to treat gastrointestinal diseases

• Direct connection to external monitors