Forty-one patients were sent to our department for CBCT-arthrography of the wrist.
the patient is seating near the X-ray table,
with the dorsal aspect of the wrist prepared sterilely and positioned horizontally upon the table.
Under fluoroscopic guidance,
puncture of the radiocarpal joint was performed on the waist of the radius and 4 ml of iodinated contrast agent was injected.
Local anaesthetic was not used.
Plain radiographs were performed and immediately afterwards,
a CBCT examination was realized using a NewTom 5G CBCT scanner (QR srl,
The patient was seated with the arm in horizontal position through the gantry opening,
with wrist and hand fixated in order to prevent motion artifacts.
Anode voltage is maximum 110 kV at 3 mA current. Measured field of view is 8x8 cm.
The scan time is about 7 seconds.
The CT images are generated by rotating an x-ray source around the wrist creating a series of flat panel detector radiographs with the patient sitting behind the gantry.
This results in an axial data set of 659 raw data images.
The reconstructed 3D-volume is displayed on a 19" screen,
which is used to manage image acquisition and data processing/reformatting.
sagittal and axial orthogonal 1 mm slices are reconstructed and sent by DICOM communication to a PACS system (Impax,
In a previous study,
a high overall accuracy (82-86%) and specificity (81-91%) was found for evaluating wrist ligaments and radiocarpal cartilage .
Due to the small number of patients in our study,
we do not report on accuracy,
positive and negative predictive value for cartilage lesions or ligamentous tears.
The main purpose of our study however was to compare radiation dose of the CBCT examinations compared with MDCT studies.
we compared the doses of the 41 CBCT studies with dose reports of 20 MDCT examinations of the wrist,
performed on a GE Brightspeed system (General Electric Medical Systems; Waukesha,
WI, USA) with 120 kV at 100 mA,
0.625 mm thickness,
0,3 mm interval,