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)
Author Archives: Nichole Morrissey
CLO 7: Summarize the importance of proper positioning
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”
CLO 8: Discuss the impact of patient preparation on the resulting radiographic image
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”
CLO 6: Apply a process for evaluating images for acceptable limits of distortion, image artifacts, radiation fog, noise and gross exposure error
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”
CLO 4: Describe the role of the radiographer in image analysis.
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.”
CLO 3: Describe an effective image analysis method
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”
CLO 1: Identify anatomy on radiographic images.
CLO 8: Adapt general procedural considerations to specific clinical settings.
“The technologist is expected to consider each patient’s general physical condition and clinical history. If the technologist feels the routines should be compromised, he/she should consult with a radiologist or technical supervisor.” Body habitus: Hypersthenic, sthenic, hyposthenic, asthenic 4 quadrants of the abdomen: RUQ, RLQ, LUQ, LLQ Angulation of CR may be required: to avoid superimpositionContinue reading “CLO 8: Adapt general procedural considerations to specific clinical settings.”
CLO 16: Apply general radiation safety and protection practices associated with radiographic and examinations
Minimize the radiation dose to the patient, to themselves, and to others: As Low As Reasonably Achievable (ALARA) Principle Maintain a safe distance from source of ionizing radiation exposure Maximize the use of shielding from ionizing radiation exposure Limit the size of the x-ray exposure field to the area of interest Select a combination of kVp and mAs toContinue reading “CLO 16: Apply general radiation safety and protection practices associated with radiographic and examinations”
CLO 15: Describe the general purpose of radiographic studies
Radiographic studies are used to diagnose or treat patients by obtaining images of the internal structure of the body. These studies are used to examine an area where you’re experiencing pain/discomfort, monitor the progression of a diagnosed disease, and to follow up on a prescribed treatment. There are several types of diagnostic radiology exams.
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