Normal Prostate Anatomy


 Longitudinal View Anatomy Prostate  Transverse Anatomy Prostate

Prostate Anatomy

Longitudinal View

Prostate Anatomy

Axial View




 Prostate Volume  Axial View Of Prostate
Prostate Volume
Axial Image



 Longitudinal Scan Prostate  Transverse Plane Prostate
Angle the probe caudally and in the  midline to get a sagittal view of the prostate.
Turn the probe 90degrees and angle caudally to get the transverse view.


 ultrasound of a prostate  Transverse View Prostate
Prostate is situated behind the bladder. Transverse View Prostate



Ultrasound of the Prostate - Protocol

Role of Ultrasound


Visualisation of the Prostate using the TRUS ( Transrectal Ultrasound) technique has improved the diagnostic ability of the sonologist. It plays an important role in most prostatic diseases. It is necessary for all prostate biopsies.

If the PSA is elevated or increasing rapidly or there is an abnormal prostate examination then a transrectal ultrasound and prostate biopsy may be indicated to obtain tissue to make the diagnosis of prostate cancer.


Transabdominal Ultrasound can assess the volume of the prostate but is not reliable to diagnose carcinoma.


Some patients are not able to cope with the probe inside their rectum for the duration of the scan ( especially for a biopsy) during a TRUS.

If patients are unable to fill their bladder with at least 60mls of fluid then an accurate volume cannot be measured using a transabdominal approach.


Equipment Selection

An endorectal, high frequency probe is used. It must have colour and doppler capabilities.3D scanning and  contrast agents such as microbubbles will improve the assessment of vascularity.

If scanning transabdominally a 3.5MHz to 6MHz curved linear array probe, depending on the size of the patient should be used.


Patient position

TRUS The rectum should be emptied prior to the scan .A small amount of fluid in the bladder is needed to identify it while scanning. The patient lies in a lateral decubitus position. Ensure that a generous amount of gel is put into the sphincter before inserting the probe.

Transabdominal technique needs the patient supine.


Scanning Technique



It si ideal to have a small amount of urine in the bladder.

Ask the patient to try and relax and "bear down" to open the sphincter  as the transducer is inserted slowly.Ensure the transducer has a latex free dedicated probe cover with plenty of gel. The highest frequency sector  probe 7-12MHz should be used.

The scanning begins in the axial plane. The seminal vesicles are examined initially. As the probe is angled caudally the base of the prostate is seen.

Once the prostate is examined in its entirety in this plane the probe is turned 90degrees in a sagittal plane. The probe is angled from one side across to the other.

A volume is taken by measuring height x length  in the sagittal plane and x width in the axial plane and multiply by 0.52.

Look for changes in the contours and echogenicity in each zone.




The patient lies supine. The patient should have a half full bladder .500 mls of water 1 hr before the scan if possible is recommended.

The probe is angled approximately 30 degrees caudal using the bladder as a window. Slight compression to ensure the inferior portion of the prostate is not obscured by the shadow artifact from the base of the bladder.



Common Pathology


Benign Prostatic Hyperplasia (BPH)

Prostate Carcinoma


Enlarged seminal vesicles

Stones in the seminal vesicles,Prostate or ejaculatory ducts







Basic Hard Copy Imaging

Image the prostate in sagittal and axial views.

Volume should be measured with the machine settings using the length, width and height.

Images using power Doppler  and contrast enhanced Doppler in suspected tumours.




Direct radiology 
Global health source


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