Clinical case: PET/CT low dose imaging

Low dose imaging

Who we are

 

Doctor Renée Ahond-Vionnet
Senior Clinical lecturer in Nuclear Medicine Department

 

Centre Hospitalier De Nevers, Nuclear Medicine Department Nevers, France

The nuclear medicine department of CH NEVERS, France, led by Dr Ahond-Vionnet, has 2 Gamma-Camera systems (one double-head Millenium MG and one hybrid Infinia Hawkeye4).

Since April 2008, the department is equipped with a GE PET/CT Discovery RX with Motion Free and PET VCAR applications.

This PET/CT system helps clinicians to improve diagnostics and therapy follow-up of patients with cancerous lesions.

Thanks to Motion Free, we help radiotherapy physicists and physicians to define more accurately the irradiation dose and volume for RT planning.

Patient History

Female - 45 years old - 163cm - 44kg

A PET/CT exam was requested for disease staging of voluminous left mediastinal-hilar tumor.

Abdominal and cerebral CT was normal one month ago.

CT : A mass in the left superior lobe with partial atelectasy ; mediastinal adenopathies difficult to differentiate from the left superior mass.

Acquisition

Scanner: GE Discovery RX

PET acquisition: Whole-body acquisition

  • 3D acquisition using VUE Point HD reconstruction
  • Acquisition time: 1 min30 per bed position
  • Post-injection time : 1h
  • Dose: 148 MBq of 18F-FDG

CT acquisition: Whole-body acquisition

  • Detector configuration: 16 x 1.25 mm
  • Slice thickness: 1.25 mm
  • kVp: 120
  • mA: 80-160 Smart mA-Auto mA

Findings

                        

          Whole-body static image highlighting
          the mediastinal-hilar lesion and the
          uptake in the right cotyle

             

CT and fused views of the mediastinal-hilar
lesion with partial atelectasy

             

Fused coronal and axial views of the uptake
in the right cotyle

Thoracic : There is a hypermetabolic
left mediastinal-hilar mass, with partial atelectasy
on the left superior lobe. Small adenopathies are
found in the anterior superior mediastinum.

There is also a small uptake on the right cotyle.

Conclusion

Confirmation of a hypermetabolic left mediastinal-hilar mass, with partial atelectasy on the left superior lobe.

Small adenopathies are found in the anterior superior mediastinum.

Uptake on the right cotyle.