Table 3.

Technical CT scanner parameters defined by different orthopaedic companies in their hip CT protocols.

Company	Field of view	kV range	mAs	Slice thickness at the pelvis	Effective dose (mSv)
Conformis	Iliac crest to mid knee joint	120	~100–200	0.5–1.5 mm	2.55 (male); 3.99 (female)
Smith & Nephew	Midpoint between AIIS and ASIS to 3 cm below lesser trochanter	120	Small patients: 100; medium patients: 150; large patients: 200	2.0–2.5 mm	3.41–6.83 (male); 4.07–8.14 (female)
Medacta	Whole pelvis to proximal femur and knees	>120	>120 mA with 2 s exposure time	0.5–1.0 mm	8.11 (male); 9.76 (female)
Stryker	Whole pelvis to proximal femur and knees	120–140	200–250 mA	0.5–1.0 mm	6.76–12.94 (male); 8.13–15.80 (female)
Materialise	Whole pelvis; the most superior point of ilium to the most inferior point of ischium	100–140 (or auto selection)	Automated modulation	1 - 1.50 mm (preferred); <3 mm (acceptable)	Cannot be computed**
Symbios	Pelvis to mid-shaft femur, knees and ankles	120	Adapted to patient morphology	1.25–2 mm (pelvis)	Cannot be computed**
Zimmer Biomet	Iliac crest to mid-femur and knees	Not specified*	Not specified*	2 mm by 2 mm; 2.5 mm by 2.5 mm or 3 mm by 3 mm	Cannot be computed**
Lima Corp.	Iliac crest to mid-femur and knees	Not specified*	Not specified*	1–2 mm	Cannot be computed**
JRI	Superior origin of sacroiliac joints to 5 cm below lesser trochanter	100–150	Not specified*	<1 mm	Cannot be computed**
HipXpert	Whole pelvis to proximal femur and knees	Not specified*	Not specified*	2–2.5 mm	Cannot be computed**
Implantcast	Above Iliac crest to below ischial tuberosity	Not specified*	Not specified*	1 mm	Cannot be computed**
OSSIS	Above Iliac crest to below ischial tuberosity	Not specified*	Not specified*	<1.25 mm	Cannot be computed**
LEXI ZedHip	Whole pelvis and femur	Not specified*	Not specified*	<2 mm	Cannot be computed**
AQ Solutions	Iliac crest to mid-femur, knees and ankles	Not specified*	Not specified*	2 mm	Cannot be computed**
MediCAD	Top of iliac crest to 20 cm distally to the centre of femoral head and knees	Not specified*	Not specified*	2.0 mm; 1.25–2.0 mm (acceptable)	Cannot be computed**
Adler	Not specified*	Not specified*	Not specified*	2 mm	Cannot be computed**
Signature Orthopaedics	Most superior point of ilium to just below most inferior point of ischium	Not specified*	Not specified*	Not specified*	Cannot be computed**

^*Information left to the discretion of the imaging centre; ^**Not enough information provided for effective dose calculations to be made.