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Factors influencing the dosimetry for high-intensity focused ultrasound ablation of uterine fibroids: a retrospective study.

Peng S, Zhang L, Hu L, Chen J, Ju J, Wang X, Zhang R, Wang Z, Chen W - Medicine (Baltimore) (2015)

Bottom Line: The aim of this article is to analyze factors affecting sonication dose and build a dosimetry model of high-intensity focused ultrasound (HIFU) ablation for uterine fibroids.The energy efficiency factor (EEF) was set as dependent variable, and the factors possibly affecting sonication dose included age, body mass index, size of uterine fibroid, abdominal wall thickness, the distance from uterine fibroid dorsal side to sacrum, the distance from uterine fibroid ventral side to skin, location of uterus, location of uterine fibroids, type of uterine fibroids, abdominal wall scar, signal intensity on T2-weighted imaging (T2WI), and enhancement type on T1-weighted imaging (T1WI) were set as predictors to build a multiple regression model.The distance from fibroid ventral side to skin, enhancement type on T1WI, size of uterine fibroid, and signal intensity on T2WI were eventually incorporated into the dosimetry model.

View Article: PubMed Central - PubMed

Affiliation: From the State Key Laboratory of Ultrasound Engineering in Medicine Co-founded by Chongqing and the Ministry of Science and Technology (SP, LZ, LH, JC, ZW), Chongqing Key Laboratory of Ultrasound in Medicine and Engineering, College of Biomedical Engineering, Chongqing Medical University; HIFU Center for Tumor Therapy (JJ, XW, RZ), 1st Affiliated Hospital of Chongqing Medical University; and Clinical Center for Tumor Therapy (WC), 2nd Affiliated Hospital of Chongqing Medical University, Chongqing, China.

ABSTRACT
The aim of this article is to analyze factors affecting sonication dose and build a dosimetry model of high-intensity focused ultrasound (HIFU) ablation for uterine fibroids. Four hundred and three patients with symptomatic uterine fibroids who underwent HIFU were retrospectively analyzed. The energy efficiency factor (EEF) was set as dependent variable, and the factors possibly affecting sonication dose included age, body mass index, size of uterine fibroid, abdominal wall thickness, the distance from uterine fibroid dorsal side to sacrum, the distance from uterine fibroid ventral side to skin, location of uterus, location of uterine fibroids, type of uterine fibroids, abdominal wall scar, signal intensity on T2-weighted imaging (T2WI), and enhancement type on T1-weighted imaging (T1WI) were set as predictors to build a multiple regression model. The size of uterine fibroid, distance from fibroid ventral side to skin, location of uterus, location of uterine fibroids, type of uterine fibroids, signal intensity on T2WI, and enhancement type on T1WI had a linear correlation with EEF. The distance from fibroid ventral side to skin, enhancement type on T1WI, size of uterine fibroid, and signal intensity on T2WI were eventually incorporated into the dosimetry model. The distance from fibroid ventral side to skin, enhancement type on T1WI, size of uterine fibroid, and signal intensity on T2WI can be used as dosimetric predictors for HIFU for uterine fibroids.

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Scatterplot of energy efficiency factor distribution correlated with distance from fibroid ventral side to skin.
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Figure 4: Scatterplot of energy efficiency factor distribution correlated with distance from fibroid ventral side to skin.

Mentions: Four multiple regression models were established: Models 1–4, but the goodness of fit of Model 4 was better than that of Models 1–3 (R2, 0.376 > 0.340 > 0.294 > 0.211). Through analysis of variance (Table 5), the probability value of F statistic was 0.000 in Model 4. Since 0.000 < 0.01, and with the introduction of predictors, its significance probability value was far <0.01, therefore, hypothesis that overall regression coefficient was 0 could be significantly rejected. At the same time, by the analysis of variance, a linear relationship was found between the dependent variable EEF and predictors (distance from fibroid ventral side to skin, enhancement type on T1WI, size of uterine fibroid, and signal intensity on T2WI) (Figs. 4–7).


Factors influencing the dosimetry for high-intensity focused ultrasound ablation of uterine fibroids: a retrospective study.

Peng S, Zhang L, Hu L, Chen J, Ju J, Wang X, Zhang R, Wang Z, Chen W - Medicine (Baltimore) (2015)

Scatterplot of energy efficiency factor distribution correlated with distance from fibroid ventral side to skin.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4554030&req=5

Figure 4: Scatterplot of energy efficiency factor distribution correlated with distance from fibroid ventral side to skin.
Mentions: Four multiple regression models were established: Models 1–4, but the goodness of fit of Model 4 was better than that of Models 1–3 (R2, 0.376 > 0.340 > 0.294 > 0.211). Through analysis of variance (Table 5), the probability value of F statistic was 0.000 in Model 4. Since 0.000 < 0.01, and with the introduction of predictors, its significance probability value was far <0.01, therefore, hypothesis that overall regression coefficient was 0 could be significantly rejected. At the same time, by the analysis of variance, a linear relationship was found between the dependent variable EEF and predictors (distance from fibroid ventral side to skin, enhancement type on T1WI, size of uterine fibroid, and signal intensity on T2WI) (Figs. 4–7).

Bottom Line: The aim of this article is to analyze factors affecting sonication dose and build a dosimetry model of high-intensity focused ultrasound (HIFU) ablation for uterine fibroids.The energy efficiency factor (EEF) was set as dependent variable, and the factors possibly affecting sonication dose included age, body mass index, size of uterine fibroid, abdominal wall thickness, the distance from uterine fibroid dorsal side to sacrum, the distance from uterine fibroid ventral side to skin, location of uterus, location of uterine fibroids, type of uterine fibroids, abdominal wall scar, signal intensity on T2-weighted imaging (T2WI), and enhancement type on T1-weighted imaging (T1WI) were set as predictors to build a multiple regression model.The distance from fibroid ventral side to skin, enhancement type on T1WI, size of uterine fibroid, and signal intensity on T2WI were eventually incorporated into the dosimetry model.

View Article: PubMed Central - PubMed

Affiliation: From the State Key Laboratory of Ultrasound Engineering in Medicine Co-founded by Chongqing and the Ministry of Science and Technology (SP, LZ, LH, JC, ZW), Chongqing Key Laboratory of Ultrasound in Medicine and Engineering, College of Biomedical Engineering, Chongqing Medical University; HIFU Center for Tumor Therapy (JJ, XW, RZ), 1st Affiliated Hospital of Chongqing Medical University; and Clinical Center for Tumor Therapy (WC), 2nd Affiliated Hospital of Chongqing Medical University, Chongqing, China.

ABSTRACT
The aim of this article is to analyze factors affecting sonication dose and build a dosimetry model of high-intensity focused ultrasound (HIFU) ablation for uterine fibroids. Four hundred and three patients with symptomatic uterine fibroids who underwent HIFU were retrospectively analyzed. The energy efficiency factor (EEF) was set as dependent variable, and the factors possibly affecting sonication dose included age, body mass index, size of uterine fibroid, abdominal wall thickness, the distance from uterine fibroid dorsal side to sacrum, the distance from uterine fibroid ventral side to skin, location of uterus, location of uterine fibroids, type of uterine fibroids, abdominal wall scar, signal intensity on T2-weighted imaging (T2WI), and enhancement type on T1-weighted imaging (T1WI) were set as predictors to build a multiple regression model. The size of uterine fibroid, distance from fibroid ventral side to skin, location of uterus, location of uterine fibroids, type of uterine fibroids, signal intensity on T2WI, and enhancement type on T1WI had a linear correlation with EEF. The distance from fibroid ventral side to skin, enhancement type on T1WI, size of uterine fibroid, and signal intensity on T2WI were eventually incorporated into the dosimetry model. The distance from fibroid ventral side to skin, enhancement type on T1WI, size of uterine fibroid, and signal intensity on T2WI can be used as dosimetric predictors for HIFU for uterine fibroids.

Show MeSH
Related in: MedlinePlus