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Determination of optimal imaging mode for ultrasonographic detection of subdermal contraceptive rods: comparison of spatial compound, conventional, and tissue harmonic imaging methods.

 Sungjun Kim  ;  Kyung Seo  ;  Ho-Taek Song  ;  Jin-Suck Suh  ;  Choon-Sik Yoon  ;  Jeong Ah Ryu  ;  Jeong Seon Park  ;  Ah Hyun Kim  ;  Ah Young Park  ;  Yaena Kim 
 Korean Journal of Radiology, Vol.13(5) : 602-609, 2012 
Journal Title
 Korean Journal of Radiology 
Issue Date
OBJECTIVE: To determine which mode of ultrasonography (US), among the conventional, spatial compound, and tissue-harmonic methods, exhibits the best performance for the detection of Implanon® with respect to generation of posterior acoustic shadowing (PAS). MATERIALS AND METHODS: A total of 21 patients, referred for localization of impalpable Implanon®, underwent US, using the three modes with default settings (i.e., wide focal zone). Representative transverse images of the rods, according to each mode for all patients, were obtained. The resulting 63 images were reviewed by four observers. The observers provided a confidence score for the presence of PAS, using a five-point scale ranging from 1 (definitely absent) to 5 (definitely present), with scores of 4 or 5 for PAS being considered as detection. The average scores of PAS, obtained from the three different modes for each observer, were compared using one-way repeated measure ANOVA. The detection rates were compared using a weighted least square method. RESULTS: Statistically, the tissue harmonic mode was significantly superior to the other two modes, when comparing the average scores of PAS for all observers (p < 0.00-1). The detection rate was also highest for the tissue harmonic mode (p < 0.001). CONCLUSION: Tissue harmonic mode in uS appears to be the most suitable in detecting subdermal contraceptive implant rods.
Appears in Collections:
1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Dept. of Obstetrics and Gynecology (산부인과학교실)
1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실)
Yonsei Authors
김성준(Kim, Sungjun) ; 김아현(Kim, Ah Hyun) ; 서경(Seo, Kyung) ; 서진석(Suh, Jin Suck) ; 송호택(Song, Ho Taek) ; 윤춘식(Yoon, Choon Sik)
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