radiology lesson #6 digital imaging

What is Digital Radiography?

The latest advancement in dental imaging, capturing images using electronic sensors instead of film.

When were X-rays discovered?

In 1895.

What is the primary medium for capturing radiographic images before digital radiography?

Film.

What does digital imaging involve?

Capturing an image using a sensor, breaking it into electronic pieces, and presenting it using a computer.

What is the benefit of digital sensors compared to film?

Digital sensors are more responsive, requiring 50-90% less radiation for image production.

What is the purpose of a digital imaging system?

To produce x-ray images almost instantly on a computer monitor.

What are the benefits of digital images?

Convenient electronic archiving, access, transfer, and enhanced treatment plan acceptance.

What type of X-ray unit is needed for digital radiography?

One capable of producing very short exposure times, with an accurate timer and rectangular collimation.

What are PhotoStimlable Phosphors?

Storage phosphors that are flexible, thin, and require a separate plate for each view.

What is the role of the Central Processing Unit (CPU) in digital imaging?

It performs operations and electronic processing of the data captured.

What are CCD sensors?

Charge Coupled Device sensors developed in the 1960s, used for intraoral imaging.

What is the main advantage of CMOS sensors over CCD sensors?

CMOS sensors are more durable, cheaper to manufacture, and have lower power requirements.

What does the term 'active area' refer to in sensors?

The portion of the sensor that actually produces the image.

What is a disadvantage of rigid digital receptors?

They can be thick and uncomfortable, making placement difficult.

What is the typical resolution of digital images?

Digital images can achieve resolutions of 6 to 22 lp/mm.

What is the significance of the periphery of dead space in sensors?

It can affect image quality and lead to retakes.

What is teleradiography?

The capability of sending images to another site, such as a referral.

What is the function of the scintillator screen in DEXIS sensors?

It converts the x-ray beam to visible light.

What are some legal issues associated with digital radiography?

Concerns related to patient data privacy and image retention.

What is the purpose of image enhancement tools in digital imaging?

To improve the visibility and diagnostic quality of captured images.

What are the requirements for a digital imaging system?

A computer-based technology with a reusable receptor to capture images in digital form.

What is the role of fiber optic face plates in digital sensors?

They transmit light to the sensor surface for image capture.

What is the importance of using FDA-cleared barriers with sensors?

To ensure infection control and patient safety.

What should be done to minimize cross-contamination after removing the barrier from a sensor?

Clean and disinfect using an EPA-registered hospital disinfectant with intermediate-level activity.

What is the protocol for sensor holders?

Most sensor holders are autoclavable and can be sterilized prior to use.

What should you always follow according to IUSD standards?

Always follow clinic protocol.

What is the first step in infection control for sensors?

Preclean and disinfect the sensor according to the manufacturer's instructions.

What should you do before inserting a sensor into a barrier?

Take care not to tear the plastic barrier.

What is the exposure time for digital sensors compared to conventional film?

Half the exposure time.

What should be done after capturing all images?

Evaluate for retakes.

What should be visible in a BWX image?

Alveolar bone should be visible without superimposition of crowns.

What is critical for good quality images?

Placement is critical, and the correct anatomic area must be represented.

How should the sensor be placed for maxillary anteriors?

Sensor is placed vertically into XCP, well into the palatal region.

What should be done to ensure the sensor is parallel to the teeth during mandibular anterior placement?

Place the sensor approximately even with the 2nd premolar/1st molar.

What is the recommended position for the sensor during horizontal BWX?

Place the sensor between the tongue and teeth.

What should you do to prevent rotation during maxillary posterior sensor placement?

Use a cotton roll to prevent rotation due to canine occlusion.

What is a tip for placing the sensor for mandibular posteriors?

Retract the cheek with a finger and slide the sensor down gently.

What is the purpose of enhancement tools like ZOOM?

To magnify the entire image or an area of the image for better detail.

What does image inversion do?

Reverses the image densities; radiopaque areas become radiolucent and vice versa.

What is pseudocolor used for?

Helpful in patient education, though it does not have documented diagnostic advantages.

What is the #1 cause of retakes in imaging?

Improper placement resulting in roots or crowns cut off and incorrect teeth not covered.

What is important for patient comfort when using digital sensors?

Gentle placement is important due to the rigidity of digital sensors.