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Optimization of Fetal Weight Estimates Using MRI: Comparison of Acquisitions

¹ Department of Radiology, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-8896.
² Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9032.

View larger version (135K): [in a new window]   Fig. 1A. —26-year-old pregnant woman. MR images obtained in axial plane of term uterus show representative examples of region-of-interest measurements (in square millimeters) in this cephalic presentation of fetal abdomen and extremities (A and B), fetal chest and upper extremities (C), and fetal head (D); images were obtained cranial to caudal in mother.

View larger version (133K): [in a new window]   Fig. 1B. —26-year-old pregnant woman. MR images obtained in axial plane of term uterus show representative examples of region-of-interest measurements (in square millimeters) in this cephalic presentation of fetal abdomen and extremities (A and B), fetal chest and upper extremities (C), and fetal head (D); images were obtained cranial to caudal in mother.

View larger version (122K): [in a new window]   Fig. 1C. —26-year-old pregnant woman. MR images obtained in axial plane of term uterus show representative examples of region-of-interest measurements (in square millimeters) in this cephalic presentation of fetal abdomen and extremities (A and B), fetal chest and upper extremities (C), and fetal head (D); images were obtained cranial to caudal in mother.

View larger version (93K): [in a new window]   Fig. 1D. —26-year-old pregnant woman. MR images obtained in axial plane of term uterus show representative examples of region-of-interest measurements (in square millimeters) in this cephalic presentation of fetal abdomen and extremities (A and B), fetal chest and upper extremities (C), and fetal head (D); images were obtained cranial to caudal in mother.

View larger version (141K): [in a new window]   Fig. 2A. —26-year-old pregnant woman. MR images obtained in coronal plane of term uterus show examples of region-of-interest measurements (in square millimeters) in this cephalic presentation of fetal extremities (A), posterior coronal image of fetus at level of fetal kidneys (B), coronal image of fetus at level of fetal heart and liver (C), and fetal head (D); images were obtained anteriorly to posteriorly in mother.

View larger version (147K): [in a new window]   Fig. 2B. —26-year-old pregnant woman. MR images obtained in coronal plane of term uterus show examples of region-of-interest measurements (in square millimeters) in this cephalic presentation of fetal extremities (A), posterior coronal image of fetus at level of fetal kidneys (B), coronal image of fetus at level of fetal heart and liver (C), and fetal head (D); images were obtained anteriorly to posteriorly in mother.

View larger version (124K): [in a new window]   Fig. 2C. —26-year-old pregnant woman. MR images obtained in coronal plane of term uterus show examples of region-of-interest measurements (in square millimeters) in this cephalic presentation of fetal extremities (A), posterior coronal image of fetus at level of fetal kidneys (B), coronal image of fetus at level of fetal heart and liver (C), and fetal head (D); images were obtained anteriorly to posteriorly in mother.

View larger version (157K): [in a new window]   Fig. 2D. —26-year-old pregnant woman. MR images obtained in coronal plane of term uterus show examples of region-of-interest measurements (in square millimeters) in this cephalic presentation of fetal extremities (A), posterior coronal image of fetus at level of fetal kidneys (B), coronal image of fetus at level of fetal heart and liver (C), and fetal head (D); images were obtained anteriorly to posteriorly in mother.

View larger version (119K): [in a new window]   Fig. 3A. —26-year-old pregnant woman. MR images obtained in sagittal plane of term uterus show examples of region-of-interest measurements (in square millimeters) in this cephalic presentation of fetal extremities (A); fetal extremities, head, and abdomen (B); fetal extremities and pelvis (C), and fetal extremities, head, and chest (D). Images were obtained from right to left in mother.

View larger version (133K): [in a new window]   Fig. 3B. —26-year-old pregnant woman. MR images obtained in sagittal plane of term uterus show examples of region-of-interest measurements (in square millimeters) in this cephalic presentation of fetal extremities (A); fetal extremities, head, and abdomen (B); fetal extremities and pelvis (C), and fetal extremities, head, and chest (D). Images were obtained from right to left in mother.

View larger version (124K): [in a new window]   Fig. 3C. —26-year-old pregnant woman. MR images obtained in sagittal plane of term uterus show examples of region-of-interest measurements (in square millimeters) in this cephalic presentation of fetal extremities (A); fetal extremities, head, and abdomen (B); fetal extremities and pelvis (C), and fetal extremities, head, and chest (D). Images were obtained from right to left in mother.

View larger version (137K): [in a new window]   Fig. 3D. —26-year-old pregnant woman. MR images obtained in sagittal plane of term uterus show examples of region-of-interest measurements (in square millimeters) in this cephalic presentation of fetal extremities (A); fetal extremities, head, and abdomen (B); fetal extremities and pelvis (C), and fetal extremities, head, and chest (D). Images were obtained from right to left in mother.

View larger version (15K): [in a new window]   Fig. 4. —Concordance coefficient (r) plot of MRI 8-mm axial fetal weight estimates (y-axis) to birth weight (x-axis) within 3 hr before delivery; r = 0.91 (95% confidence interval = 0.83-0.95).

View larger version (16K): [in a new window]   Fig. 5. —Concordance coefficient (r) plot of MRI 5-mm sagittal fetal weight estimates (y-axis) to birth weight (x-axis) within 3 hr before delivery; r = 0.83 (95% confidence interval = 0.69-0.91).

View larger version (16K): [in a new window]   Fig. 6. —Concordance coefficient (r) plot of MRI 3-mm coronal fetal weight estimates (y-axis) to birth weight (x-axis) within 3 hr before delivery; r = 0.84 (95% confidence interval = 0.70-0.92).

View larger version (16K): [in a new window]   Fig. 7. —Concordance coefficient (r) plot of sonographic fetal weight estimates (y-axis) to birth weight (x-axis) within 3 hr before delivery; r = 0.78 (95% confidence interval = 0.60-0.88).

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