The purpose of the study to evaluate Five-Dimensional Ultrasound in automated measurement of the fetal femur length at third trimester of pregnancy.
This is a Prospective pilot study that will be performed at the Fetal Care Unit at Ain Shams University Maternity Hospital. Ninety pregnant women will be recruited from the the Fetal Care Unit who will fulfill the inclusion criteria. They will be counseled to be included into the study. All cases will be subjected to: 1. Full history taking including patient's age, parity, last menstrual period, estimated gestational age by dates, past history of medical disorders, clinical examinations (General and abdominal). 2. Two-Dimensional Ultrasound and Five-Dimensional Ultrasound will be done for all cases for assessment of fetal femur length . The FL at Two-Dimensional Ultrasound (Gold standard) will be made from the center of the 'U' shape at each end of the bone. The FL at Five-Dimensional Ultrasound will be measured by Pressing Five-Dimensional Ultrasound long bone Button to extract Fetal Long Bones automatically. The estimation of gestational age by femur length by Two-Dimensional Ultrasound and Five-Dimensional Ultrasound will be compared to gestational age calculated by accurate dates of the last menstrual period.
Study Type
OBSERVATIONAL
Enrollment
90
Gestational Age Calculated by Accurate Dates of the Last Menstrual Period
The patient must be sure of her last normal menstrual period, last three regular cycles and no hormonal contraception before pregnancy. Gestational age calculated by the last menstrual period
Time frame: 26 - 40 weeks of gestation
Gestational Age Calculated by Femur Length Measurement by Two-Dimensional Ultrasound
The femur length at Two-Dimensional Ultrasound (Gold standard) was made from the center of the 'U' shape at each end of the bone. After the long axis of the fetus was identified, the transducer was turned 90 degrees to produce a cross sectional image of fetal trunk, maintaining the 90 degrees angle until the lower spine and iliac crest were identified, then the transducer was rotated until a full femur was imaged. The femur length was measured from the center of the "U" shape at each end of the bone; this represented the length of the metaphysis). then , Gestational Age Calculated by femur length measurement
Time frame: 26 - 40 weeks of gestation
Gestational Age Calculated by Femur Length Measurement by Five-Dimensional Ultrasound
The femur length at Five-Dimensional Ultrasound: To obtain 3D volume data, the entire bone length of the femur was identified on the screen, as in the 2D-ultrasound measurement, and the long axis of the femur was placed in the direction of the x axis in the image in which the ultrasound beam was perpendicular to the bone. The 5D LB set key was pressed on the system, wherein the system automatically analyzed the 3D volume data, reconstructed the 3D image of the long bones, and displayed the measured length of the femur length on the screen was measured by pressing 5D LB Button to extract Fetal Long Bones automatically. then, gestational Age Calculated by femur length measurement
Time frame: 26 - 40 weeks of gestation
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