Category Archives: Image Analysis

Too few x-ray photons (not enough mAs) = quantum noise What is quantum mottle? Grainy appearance on an image caused by underexposure What does quantum mottle look like? Black and white speckles How is quantum mottle caused? not enough x-ray photons How do you get rid of quantum mottle? Increase technique (kVp & mAs)

Positioning is based on body part being imaged, condition of patient, and suspected disease. Body positioning is important because many of the internal structures superimpose over each other, therefore, certain positions are required to get a clear view of the area of concern. Ex. Chest X-ray: The heart lies more anterior and a little toContinue reading “CLO 7: Summarize the importance of proper positioning”

Ex. Abdomen Patient needs to be fully changed in gown for an abdomen study. A pillow under their head and support under their knees for support will enhance patient comfort. A key factor in quality abdominal imaging is the prevention of motion; this is why breathing instructions are required for this exam. Using the shortestContinue reading “CLO 8: Discuss the impact of patient preparation on the resulting radiographic image”

Was the correct SID used? Does the projection demonstrate the least possible amount of size distortion? Does the projection demonstrate undesirable shape distortion? Was the part positioned with the least amount of OID possible? Does the projection demonstrate signs of undesirable patient motion or respiration? Are there anatomic artifacts demonstrated? Was scatter controlled with grids/collimation?Continue reading “CLO 6: Apply a process for evaluating images for acceptable limits of distortion, image artifacts, radiation fog, noise and gross exposure error”

The technologist must be able to make an analysis of each radiographic image they take to determine if the image is acceptable. They must asses the following: Superimposition, adjacent structures, brightness, contrast, spatial resolution, magnification, and shape distortion. Although the technologist can not control involuntary motion such as a heartbeat, they can control voluntary motionContinue reading “CLO 4: Describe the role of the radiographer in image analysis.”

Evaluating a projection after the exposure is made: Demographic information is included Projection is accurately displayed Correct marker placement Appropriate collimation Relationships between the anatomic structures are accurate for the projection demonstrated Projection demonstrates maximum spatial resolution Radiation protection practice: Is gonadal shielding evident and accurately positioned when gonads are within the beam range? IsContinue reading “CLO 3: Describe an effective image analysis method”