Head-to-Head Comparison of ⁶⁸Ga-Citrate and ¹⁸F-FDG PET/CT for Detection of Infectious Foci in Patients with Staphylococcus aureus Bacteraemia

Table 2

Quantitative ¹⁸F-FDG and ⁶⁸Ga-citrate PET/CT findings.

Patient number	Visually active findings	^18F-FDG		^68Ga-citrate
			TBR		TBR
	Infectious foci
()	Blood background	1.4	—	2.1	—
	Vertebral osteomyelitis	6.1	4.4	7.3	3.5
	Psoas/paravertebral abscess	10.6	7.6	6.1	2.9
	Left elbow abscess	9.4	6.7	4.0	1.9
	Three soft tissue infectious foci in left arm	7.3; 6.3; 5.4	5.2; 4.5; 3.9	5.0; 3.6; 3.5	2.4; 1.7; 1.7
	Soft tissue infectious focus in left gluteus	3.7	2.6	2.1	0.8
()	Blood background	1.3	—	2.9	—
	Vertebral osteomyelitis	7.4	5.7	11.1	3.8
	Pneumonia, right lung	2.7	2.1	3.7	1.3
	Pneumonia, left lung	3.9	3.0	3.1	1.1
()	Blood background	1.4	—	2.4	—
	Septic arthritis and osteomyelitis, I toe	5.3	3.8	2.7	1.1
	Soft tissue infectious focus, I toe	4.6	3.3	2.9	1.2
()	Blood background	1.4	—	4.1	—
	Vertebral osteomyelitis	5.3	3.8	5.9	1.4
	Shoulder abscess	4.5	3.2	4.2	1.0
	Septic arthritis, glenohumeral joint	5.0	3.6	2.5	0.6
	Septic arthritis, sternoclavicular joint	7.7	5.5	6.2	1.5
	Other metabolic findings
()	Active spleen	2.9	2.1	2.7	1.3
	Ascending aorta	1.6	1.1	2.0	1.0
()	Parotid, unexplained	1.8	1.4	9.4	3.2
	Reactive lymph nodes, neck right side	2.5	1.9	5.6	1.9
	Inferior vena cava, thrombosis	2.5	1.9	8.6	3.0
	Ascending aorta	1.6	1.2	6.6	2.3
()	Caecum, unspecific uptake	12.6	9.0	1.7	0.7
	Descending colon, tubular adenoma	9.7	6.9	7.8	3.3
	Ascending aorta	2.1	1.5	5.4	2.3
()	Reactive lymph nodes, neck right side	6.8	4.9	4.6	1.1
	Reactive lymph nodes, neck left side	6.6	4.7	3.7	0.9
	Ascending aorta	1.2	0.9	4.6	1.1

Determined from heart left ventricle cavity, ; TBR, target-to-background ratio ().