US with Extended Field of View: Phantom-tested Accuracy of Distance Measurements

Abstract

To evaluate the accuracy of distance measurements obtained with the extended-field-of-view (FOV) software of a commercially available ultrasonographic scanner, two custom-designed phantoms that allowed scanning of flat and curved surfaces were used. Five hundred forty measurements of various known distances in the phantoms were made by three examiners using various transducers. Although minor differences were observed between operators and transducers, 99.4% (537 of 540) of the distance measurements were accurate within plus or minus 4%. This extended-FOV technology provides accurate measurements of large objects in vitro.

Assessment of quadriceps muscle cross-sectional area by ultrasound extended-field-of-view imaging

“…They found a good agreement between the EFOV US and MRI methods with mean difference of 2.97 cm 2 and high ICC of 0.905. Combined, these data are congruent with those obtained on anatomical phantoms (Fornage et al 2000) and show that the algorithms processing the US images are probably accurate. The EFOV technique is therefore a very useful scanning procedure for detecting anatomical CSAs and volumes.…”

“…The CSA measured from the imaging plane that is perpendicular to the scanning table as during CT scans (line x) is not perpendicular to the muscle at this region (line y). Therefore CSA measured in plane y, as during EFOV US imaging, would be a more accurate estimate of the anatomical CSA are not confident that this is the case because a high level of validity has been shown in work using phantoms of known size (Fornage et al 2000) and a high validity was shown in the present study at some thigh regions. Ahtiainen et al (2010) also suggest that the compression of the muscle tissue cannot be excluded as a factor affecting CSA measurements, however great care was taken in their study and also in the present study to ensure tissue compression did not occur.…”

“…EFOV techniques enable the acquisition and recording of a panoramic image up to 60 cm in length (Kim et al 2003). The EFOV technique has been shown to be accurate for distance measurements of custom-designed flat-and curved-surfaced phantoms (Fornage et al 2000) and quantification of the sizes or volumes of large abdominal organs or lesions (Kim et al 2003). To the best of our knowledge, only one study (Ahtiainen et al 2010) has reported the reliability and validity of the technique for measuring skeletal muscle CSA.…”

Extended field of view sonography: A useful tool in the diagnosis and management of abdominal pregnancy

“…The geometric accuracy of EFOV measurements was verified experimentally using a phantom. 7 EFOV sonography has been used in gynecology to visualize large fibroids and tumors along with their surrounding tissues and in obstetric practice to visualize twins and relationships between the placenta and fibroids. 8,9 The 2 cases of abdominal pregnancy presented here demonstrate the value of EFOV sonography in confirming the diagnosis of abdominal pregnancy at a late gestational age.…”

Correction of Probe Pressure Artifacts in Freehand 3D Ultrasound

“…Advances in high resolution ultrasound are increasingly enabling detailed examination of musculoskeletal anatomy [2,8]. However, typical high resolution ultrasound images (B-scans) have a limited field of view: in order to visualise a larger volume, the B-scans must be combined into a composite data set.…”