Breast Instrumentation/Technique Flashcards
An imaging artifact that results in the filling in of cystic structures due to lack of finite beam width
Volume Averaging
Approximately what percentage of women will be diagnosed with Breast Cancer?
12.4% (1 in 8 women)
Average Speed of Sound in Breast Tissue
1450 m/sec
Axial Resolution is equal to:
1/2 the spatial pulse length of the transducer being used.
1.5D transducers permit focusing on which plane?
Elevation Plane
At what rate is high frequency ultrasound attenuated for soft tissues?
0.5 dB/cm/MHz
Best scanning technique when patient presents with nipple discharge
Convergent Scanning technique
Are benign breast lesions more easily compressible than malignant?
Yes
Do malignant lesions appear larger on elastogram than on grey scale image?
Yes
Best frequency for scanning breast ultrasound
10.0 MHz
What is system gain?
Determines the amount of amplification an echo receives prior to reaching our tv monitor
Vascular flow patterns most suspicious for Breast tumor malignancy
Mean flow velocities in the 25-40 cm/sec range on color flow Doppler
Extended field of view imaging results in:
Improved interrogation of the chest wall and pleura
Spatial resolution improves with:
Increasing transducer frequency
Annotate a Left breast mass located at 7:00, midway between the nipple and periphery in the mid breast.
L 7:00 2 B
Most popular breast scanning technique
Convergent technique
Why does the “Bayonet Sign” occur
The ultrasound system assumes the speed of sound in the tissues being examined is 1540 m/sec
Most significant reason why ultrasound should Not be used as a breast cancer screening tool
Ultrasound lacks the detail resolution of mammography
Harmonic Imaging eliminates many artifacts
True
Which imaging modality is an adaptation of the Fremitus technique
Sonoelastography
What does the TGC control do
Adjusts the strength of returning echoes based on the depth from which they originate
Most common method of breast cancer detection
Screening mammography
Optimal patient positioning when scanning a parasternal left breast lesion
Supine
Ultrasound contrast agents are typically made of encapsulated bubbles of what size?
5-7 microns