3D/4D Ultrasound
Volumetric Imaging in Gynaecology and Obstetrics
· GE Voluson System
What Is 3D/4D Ultrasound?
Standard ultrasound (2D) produces flat, single-plane images of the pelvic organs.
The clinician manually moves the transducer and mentally integrates multiple views to assess anatomy,
a process that is inherently dependent on operator experience and prone to variability.
3D ultrasound captures a complete volumetric dataset of the area being examined, a block of data that can be stored,
rotated, and reconstructed in any orientation, including the coronal plane.
The coronal plane is clinically critical in gynaecology because it is physically inaccessible with conventional 2D ultrasound,
yet it provides the most complete view of the uterine cavity and fundal contour simultaneously.
4D ultrasound is real-time 3D imaging, volumetric data captured continuously as a live video sequence.
This allows the assessment of dynamic structures:
fetal movement, facial expressions, cardiac function, and limb coordination.
Gynaecological Indications
Congenital Uterine Anomalies
- Congenital uterine malformations affect approximately 5.5% of the general population, rising to 8% in infertile patients and 13.3% in women with recurrent miscarriage. Accurate classification is essential because different anomaly types carry different clinical implications and treatment pathways.
- Standard 2D ultrasound cannot simultaneously assess the internal endometrial cavity and the external uterine contour. The 3D coronal plane provides both views in a single reconstruction, enabling classification according to ESHRE/ESGE and ASRM guidelines, distinguishing septate, bicornuate, arcuate, unicornuate, and T-shaped uterine morphologies with diagnostic accuracy comparable to MRI.
Uterine Fibroids
- Fibroids affect over 50% of women and are a common cause of abnormal bleeding, pelvic pain, and subfertility. 3D ultrasound maps the spatial relationship of each fibroid to the endometrial cavity, classifying submucosal myomas as G0, G1, or G2, which determines eligibility for hysteroscopic resection and guides surgical planning.
Adenomyosis
- 3D transvaginal ultrasound provides detailed assessment of the junctional zone, the myometrial-endometrial interface. Characteristic findings including junctional zone irregularities, subendometrial lines and buds, and myometrial cysts can be identified and differentiated from fibroids.
Endometrial Polyps
- Polyps are a common cause of abnormal uterine bleeding and subfertility. When 3D imaging is combined with colour Doppler, the pedicle artery sign, a single feeding vessel supplying the polyp, is visualised with a sensitivity of 94% and specificity of 100%, reliably distinguishing true polyps from mucosal thickening or normal endometrial folds.
IUD Positioning
- Standard 2D ultrasound routinely fails to visualise the complete lateral arms of an IUD, missing cases of partial displacement, myometrial embedding, or rotational malposition. The 3D coronal plane displays the full T-shaped structure of the device in a single view, allowing definitive assessment of correct placement.
Ovarian Assessment and Fertility Evaluation
- In reproductive medicine, automated follicle counting software uses 3D inversion rendering to detect, count, and calculate individual follicle volumes across the entire ovary in seconds, providing a standardised assessment of ovarian reserve and response to stimulation that is more reproducible than manual 2D measurements.
Pelvic Floor Assessment
- Translabial 3D ultrasound allows simultaneous visualisation of the urethra, vagina, rectum, and levator ani muscle complex, providing information on pelvic organ support, levator ani integrity following vaginal delivery, and the positioning of surgical mesh or urethral slings.
Obstetric Indications
First Trimester (Weeks 11–14)
- Volumetric ultrasound in early pregnancy supports accurate dating, early structural evaluation, and risk stratification. 3D transvaginal imaging demonstrated a clinical diagnostic impact in 96.6% of early pregnancy complications, compared to 89.6% for standard 2D scanning, with superior accuracy for gestational sac volume, yolk sac assessment, and embryonic growth.
- Semi-automated tools measure nuchal translucency (NT) and intracranial translucency (IT) for aneuploidy and early CNS screening.
Fetal Brain and Central Nervous System
- Fetal neurosonography requires multiplanar visualisation of the brain along coronal and sagittal planes that are often inaccessible with standard 2D scanning. 3D multiplanar reconstruction allows systematic evaluation of the corpus callosum, lateral ventricles, posterior fossa, cerebellar vermis, and cavum septi pellucidi, structures whose absence or abnormality indicate conditions including corpus callosum agenesis, holoprosencephaly, and septo-optic dysplasia.
Fetal Face and Skeletal Anatomy
- 3D surface rendering provides detailed visualisation of fetal facial anatomy, supporting the assessment of cleft lip and palate, micrognathia, and orbital abnormalities. Skeletal anomalies, including spina bifida, rib cage hypoplasia, and extremity malformations, are evaluated using maximum-mode and transparency rendering, which highlights ossified structures.
Fetal Cardiac Assessment
- Real-time 4D imaging combined with Spatiotemporal Image Correlation (STIC) technology enables comprehensive fetal echocardiography. From a single automated sweep, the system generates a dynamic 4D cardiac loop that can be navigated retrospectively through all standard cardiac views, four-chamber, outflow tracts, and three-vessel trachea, supporting the detection of complex structural defects including transposition of the great arteries, tetralogy of Fallot, and septal defects.
Placenta and Umbilical Cord
- 3D colour and power Doppler map the vascular architecture of the placenta and cord, identifying abnormal cord insertions (velamentous, marginal), vasa praevia, and placental invasion in cases of suspected placenta accreta spectrum.
Fetal Growth and Wellbeing
- In high-risk pregnancies, Doppler assessment of the umbilical artery, middle cerebral artery, ductus venosus, and uterine arteries monitors fetal vascular resistance and flow velocities, enabling early detection of fetal growth restriction and haemodynamic compromise.
What to Expect During the Examination
- Preparation - For transabdominal pelvic or obstetric scans, patients are asked to drink 1–2 glasses of water approximately 30–45 minutes before the appointment and to avoid urinating until the examination is complete. A full bladder provides an acoustic window that improves image quality.
- Preparation - For transvaginal gynaecological scans, patients should empty their bladder immediately before the examination begins.
- During the scan - The patient lies comfortably on the examination table. A water-soluble gel is applied to the skin for transabdominal scanning. For transvaginal examinations, a sterile covered probe is used. During volume acquisitions, the patient may be asked to hold their breath briefly to minimise motion. The system captures the volumetric data automatically; the clinician then navigates and analyses the reconstructed images.
- Duration - A standard 3D/4D pelvic or obstetric examination takes approximately 20 to 45 minutes. Complex diagnostic assessments may require longer.
- Safety - 3D and 4D ultrasound use non-ionising sound waves. There are no known biological hazards associated with diagnostic ultrasound when performed by qualified professionals using approved equipment.
- Safety - 3D and 4D ultrasound use non-ionising sound waves. There are no known biological hazards associated with diagnostic ultrasound when performed by qualified professionals using approved equipment.
Who Should Consider This Examination?
3D/4D ultrasound is recommended for women undergoing gynaecological evaluation or obstetric follow-up who require a more detailed structural assessment than standard 2D imaging can provide.
It is particularly indicated for patients with suspected uterine anomalies, fibroids, endometrial polyps, or ovarian pathology, as well as those undergoing fertility workup or IUD placement verification.
During pregnancy, it is recommended from the first trimester onward, for early anatomical screening, fetal cardiac assessment, placental evaluation, and growth monitoring.
A consultation with Dr. Diana Dram-Flutur is required before the examination, to confirm clinical indication and ensure the most appropriate imaging protocol is selected.
Schedule a Consultation
Ultrasound examinations at Nexxmedis are performed by Dr. Diana Dram-Flutur using the GE Voluson system.
All ultrasound examinations are performed by a qualified gynaecologist.
This page is intended for informational purposes and does not constitute medical advice.
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