Hounsfield units - Study guides, Class notes & Summaries

Window vs. Reconstruction on CT? correct answersReconstructions - processing of the raw CT data allows for better resolution of the structures [higher resolution and higher contrast] Reconstruction can be done in 3D (ortho) or in a linear way too (vascular) What is the total range of hounsfield units availabe? correct answers-1000 (air) to +1000 (metal) [so range is 2000] What does a typical computer display show for greyscale range? What can the human eye actually distinguish? corr...

Window vs. Reconstruction on CT? correct answersReconstructions - processing of the raw CT data allows for better resolution of the structures [higher resolution and higher contrast] Reconstruction can be done in 3D (ortho) or in a linear way too (vascular) What is the total range of hounsfield units availabe? correct answers-1000 (air) to +1000 (metal) [so range is 2000] What does a typical computer display show for greyscale range? What can the human eye actually distinguish? correct...

Aquifer - Radiology Actual Exam Questions With Answers Window vs. Reconstruction on CT? - ANSWER- Reconstructions - processing of the raw CT data allows for better resolution of the structures [higher resolution and higher contrast] Reconstruction can be done in 3D (ortho) or in a linear way too (vascular) What is the total range of hounsfield units availabe? - ANSWER- -1000 (air) to +1000 (metal) [so range is 2000] What does a typical computer display show for greyscale range? What...

MDCB Concepts Latest Updated 2024/2025 with Complete Solutions Hounsfield Units - Correct Answer A measure of the beam attenuation capability of a specific structure. Also called pixel values, density numbers or CT numbers. HU = 1000 · [µ(tissue) - µ(water)] ÷ µ(water) bone ∼ 1000 tissue ∼ 0 air ∼ -1000 Factors in Calculating Monitor Units - Correct Answer output factor scatter factors (Sc, Sp, Scp) inverse square factor depth dose factor (PDD, TMR) off-axis factor transm...

Uniformity test - Answer Water phantom is used in this test to get the same Hounsfield units on entire image Accuracy test - Answer Test of accuracy of the CT numbers or calibration standard deviation - Answer Measures noise, mottle, or graininess in image Linearity test - Answer The relative accuracy between calculated CT numbers and their

The main advantages of CT over conventional radiography are -Elimination of superimposed structures - the ability to differentiate small differences in density of an atomic structures - superior quality of the images Computer tomography for technologists exam review Romans chapter 1 page 3 CT image quality is evaluated using a number of criteria including - spatial resolution - low contrast resolution - temporal resolution Computer tomography for technologists exam review Romans...

Aquifer - Radiology Question and answers 100% correct 2023/2024 Window vs. Reconstruction on CT? - correct answer Reconstructions - processing of the raw CT data allows for better resolution of the structures [higher resolution and higher contrast] Reconstruction can be done in 3D (ortho) or in a linear way too (vascular) What is the total range of hounsfield units availabe? - correct answer -1000 (air) to +1000 (metal) [so range is 2000] What does a typical computer display show for...

Abnormaties of the middle and inner ear may be best demonstrated using what size CT sections? - 1-2mm Name three portions of the small bowel. - Duodenum jejunum ileum A _____is a benign, highly vascular mass commonly found in the liver. - Hemangioma Simple cysts of the kidney have average attenuation values in the range of? - 0 to +20 hounsfield units The proper scan field of view (SFOV) for a CT of the abdomen of a patient who measures 42 cm is - Large (48cm) CT images of the chest shou...

Aquifer - Radiology Study Guide Test 2024. Window vs. Reconstruction on CT? - correct answer Reconstructions - processing of the raw CT data allows for better resolution of the structures [higher resolution and higher contrast] Reconstruction can be done in 3D (ortho) or in a linear way too (vascular) What is the total range of hounsfield units availabe? - correct answer -1000 (air) to +1000 (metal) [so range is 2000] What does a typical computer display show for greyscale range? Wh...