This is the content of the pop-over!





DANB's LDRT (LDRT) Practice Tests & Test Prep by Exam Edge - Free Test


Our free DANB's Licensed Dental Radiologic Technologist (LDRT) Practice Test was created by experienced educators who designed them to align with the official Dental Assisting National Board content guidelines. They were built to accurately mirror the real exam's structure, coverage of topics, difficulty, and types of questions.

Upon completing your free practice test, it will be instantly reviewed to give you an idea of your score and potential performance on the actual test. Carefully study your feedback to each question to assess whether your responses were correct or incorrect. This is an effective way to highlight your strengths and weaknesses across different content areas, guiding you on where to concentrate your study efforts for improvement on future tests. Our detailed explanations will provide the information you need to enhance your understanding of the exam content and help you build your knowledge base leading you to better test results.

Login or Create an Account to take a free test

After you have completed your free test you will receive a special promo code that will save your between 10-15% on any additional practice tests!


** Sample images, content may not apply to your exam **


Additional test information
Back To General Exam Info

DANB's Licensed Dental Radiologic Technologist - Free Test Sample Questions

The term that describes shadows appearing on the image that impair its definition is called:





Correct Answer:
geometric unsharpness.


the correct term that describes shadows appearing on an image that impair its definition is called "geometric unsharpness." this phenomenon often occurs in radiographic imaging and is particularly significant in fields such as dental radiography and industrial radiography. geometric unsharpness refers to the loss of clarity in an image due to the relative positions of the radiation source, the object being imaged, and the image receptor.

geometric unsharpness arises when there is a significant distance between the object and the image receptor, or when the radiation source is too close to the object. this positioning leads to a scenario where parts of the object are projected as larger or more blurred than they actually are, creating shadows and unclear areas in the final image. this distortion occurs because the rays of radiation do not project orthogonally (at right angles) to the recording surface, but instead spread out over a larger area, leading to a magnification of parts of the object and a corresponding loss of detail.

in practical terms, geometric unsharpness can result in inaccuracies in the image, such as an inaccurate duplication of structures like teeth in dental radiography. this can impair diagnostic capabilities as the details necessary for accurate assessment are obscured or distorted. to minimize geometric unsharpness, optimal positioning is crucial. this involves adjusting the distance between the radiation source and the object, and between the object and the receptor, to reduce the spread of the radiation beam and ensure it is as perpendicular as possible to the receptor.

understanding and controlling geometric unsharpness is essential for producing high-quality radiographic images. it involves careful consideration of the setup and positioning of the radiographic equipment relative to the object being imaged. by optimizing these factors, the impact of geometric unsharpness can be minimized, leading to clearer, more accurate images that are crucial for effective diagnosis and analysis.