GE Discovery LS - Chapter 6 Table; Section 6.1 CT-PET Table Functional Description; 6.1.1 Table Overview; 6.1.2 Manual Table Functional Description

GE HEALTHCARE
DIRECTION 2307224-100, REVISION 6DISCOVERY LS SYSTEM SERVICE MANUAL
Chapter 6 - Table Page 111
Chapter 6 - Table
6.1 CT-PET Table Functional Description
6.1.1 Table Overview
The patient table is a common CT-PET subsystem used for both acquisition procedures. The table
positions the patient in the imager’s Field of View (FOV). The table moves in the cradle horizontal
and vertical axes for patient positions. These movements are standard in both regular CT and PET
acquisition procedures.
A new axis was added, the Secondary Base axis, moving the entire table base from the CT FOV
position to the PET FOV position. Three table configurations were developed for the CT-PET
system:
• Manual Table – 1,650 mm cradle scannable range with manual secondary base axis.
• Automated Table – 1,650 mm cradle scannable range with automated secondary base
axis.
The functions performed by the electronics within the table include:
• Table cradle longitudinal drives
• Table elevation
• Table base positioning setup (CT-PET)
Patient positioning (longitudinal/elevation) is performed manually using the gantry-mounted
operator controls. Table base positioning (CT-PET) is performed manually using a separate hand
control box or through the gantry-mounted operator control for the manual table or the automated
and extended table respectively.
The drives provide horizontal and vertical positioning of the patient. Longitudinal motion of the
cradle provides horizontal positioning through each CT or PET scan plane. Longitudinal motion and
CT-PET base positioning can also be controlled with console pushbuttons, which are used to
advance the patient to the next position.
6.1.2 Manual Table Functional Description
The Manual CT-PET table consists of the following parts:
• An upper table assembly containing the table top, longitudinal drive assembly, the cradle,
the elevation drive assembly and the table base. The upper table assembly is identical to
the H2 LightSpeed table.
• A secondary table base containing two transport rails, a table base drive mechanism
based on added DC driver (KB Box), a locking bar with two locking devices, a pedal for
releasing the lock, two adjusters, and a grounding bar.
• A retractor assembly that carries and protects the cables connecting the table and the
CT Gantry.