GE LightSpeed VCT 数据表：高级体积CT技术

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"此文件是关于GE Healthcare的LightSpeedTM VCT (Volume Computerized Tomography) 和 LightSpeed VCT XTe 数据表，详细介绍了这两款先进的医学成像设备的技术特点和优势。文档版本为Revision 10，由Joseph W. Minessale发起，Nilesh M. Shah批准，日期为2009年7月7日。" LightSpeed VCT 和 LightSpeed VCT XTe 是GE Healthcare推出的CT扫描仪，它们在非侵入性或低侵入性诊断成像领域提供了创新技术。这两款设备的核心区别在于它们能够同时实现体积覆盖和薄层图像扫描，这是传统多层螺旋CT扫描仪所无法比拟的。这一独特设计使得临床医生在进行诊断时可以更灵活地获取高分辨率的三维图像，从而提高诊断的精确性和效率。 LightSpeed VCT 的技术亮点在于其体积CT技术，它允许快速连续地获取大量数据，生成无间隙的容积图像。这种能力对于动态观察体内过程（如心脏功能评估）或者对大范围区域进行详细检查（如全身血管造影）非常有用。同时，由于能够同时进行薄层成像，它能提供更高清晰度的细节图像，这对于发现微小病灶或进行精细结构分析至关重要。 LightSpeed VCT XTe 是LightSpeed VCT 的高端配置，可能包含了更多的高级功能和优化的硬件性能。虽然具体配置没有详细列出，但通常这样的顶级平台会提供更快的扫描速度、更高的图像质量以及更多的定制选项，以满足更复杂、更专业的需求。此外，数据表还包含了联系信息，如GE Healthcare在美国、日本和法国的传真号码，这表明该设备在全球范围内销售和服务。文档最后强调，打印版仅用于参考，而正式的文件应该是PDF格式，并且已经通过了审批流程。总结来说，LightSpeed VCT 和 LightSpeed VCT XTe 是GE Healthcare的先进CT成像系统，它们的创新技术在于同时实现大范围覆盖和高分辨率扫描，为临床诊断提供了更为精准和全面的影像数据。这些设备的出现，无疑提升了医学成像的水平，有助于医生进行更准确的疾病诊断和治疗规划。

Released

Rendered PDF File Page 7 of 37 DOC0306058, Rev:10

Product Data Sheet – Rev 10

July 6, 2009

Page 6/19

Option

†

May not be available in all markets

LightSpeed VCT

LightSpeed VCT / LightSpeed VCT XTe

GE Healthcare

Milwaukee, USA - Fax: 1 262 544 3384

Tokyo, Japan - Fax: 81 425 85 5490

Paris, France - Fax: 33 1 30 70 94 35

 A preprogrammed selection of AutoView and Image Review Layouts

allow simple customization of the image presentation to match the

anatomical area of interest - without the complexity of free-form

“windows”.

 ImageWorks™ provides instant access to advanced image processing

features such as MIP, MPR, MPVR, Volume Viewer 3.1*, AVA Xpress*,

CT Perfusion 4* – Neuro or Multi-Organ, DentaScan*, CardIQ Xpress 2.0

Plus*, Advantage CTC Pro*, CardEP*, Neuro 3D Filter, ASIR Review*,

Add/Subtract and AutoBone Xpress*.

 Background filming allows use of the full screen for AutoView and image

review/processing without interruption when auto or batch filming.

Special “one touch” controls provide on-screen viewing of camera

progress during AutoFilm without disrupting other image processes in

progress.

 ProView™ visualization algorithms available to enhance anatomical

structures without additional image reconstruction time.

 Application Auto-Launch for Neuro 3D Filters provides the ability to

prescribe the automatic application of the prescribed filter prior to the

scan acquisition.

 Operator console convenient to place in suite.

- Computer, image processor and image reconstruction hardware

completely integrated in base of console - no separate computer

cabinet to site;

- Split console table top allows unrestricted patient viewing while still

supporting 2 large color LCD monitors;

- Front and back work surfaces can be set during installation within a

range of vertical heights that help accommodate a variety of siting

requirements - especially surrounding the height of the console

relative to the window into the scanning suite.

 Direct network connection means a multi-suite Ethernet card is not

required for a gateway out of the suite - saving costs and simplifying

installation.

 Learning Solutions provides an on-line Operator manual detailing

system operation via a multi-media CD-ROM player integrated into the

media tower. Learning Solutions can also be accessed on a stand -alone

PC providing flexibility and productivity for on demand learning of

system operation.

Scan Modes

The LightSpeed VCT/VCT XTe system can perform virtually any clinical

application due to its wide variety of scan modes.

Helical:

 Continuous 360° scanning with table incrementation and no interscan

delay.

 Scans can be acquired in a wide variety of speeds.

Axial:

 Up to 64 contiguous axial slices acquired simultaneously with each 360°

rotation, with the time between scans set by the user-selected interscan

delay (ISD) or intergroup delay (IGD).

 Scans may be easily clustered in groups to allow multiple scans in a

single breath hold.

 Minimum scan-to-scan cycle time of only 1.0 second with table moves

of  10 mm (any scan time).

Cine:

 Up to 64 contiguous axial slices acquired simultaneously with each 360°

rotation.

 Minimum scan-to-scan cycle time of only 1.0 second with table moves

of  10 mm.

 Half-scan imaging and segmented reconstruction is supported with

acquisitions times of 0.65 times that of the scan speed.

Scout™:

 Single radiographic plane for scan localization and graphical prescription

of prospective reconstruction;

 Extended range matches helical scannable range.

Typical scan protocols include (with VT2000 Table):

Chest/Ab/

Pelvis

Peripheral

Run-Off

High-Res

Chest

ECG-Gated

Cardiac

Coverage (mm) 600 1,700 200 120

Rotation (s) 0.4 0.5 0.5 0.35

Mode (mm) 64 x 0.625 64 x 0.625 64 x 0.625 64 x 0.625

Pitch 1.375:1 1.375:1 1.375:1 0.22:1

mA 550 600 380 450

mAs 220 300 190 158

Speed (mm/s) 137.5 110 137.5 25.1

Scan Time (s) 4.36 12.8 1.45 4.8

The net result is that in many cases, helical scans are up to 4 times faster

than 16-slice CT systems. With the LightSpeed VCT/VCT XTe, users can

routinely use a 0.40 second, or 0.35 second scan speed for cardiac, and

nominal 0.516:1, 0.984:1, and 1.375:1 helical pitches. This added

performance, at the same image quality, may allow you to: perform better

thin-slice CT angiography exams, use thinner slices for most exams, and

perform longer helical exams without tube cooling delays.

Helical Scans

Slip ring technology has advanced axial scanning by enabling scans with

zero interscan delay and simultaneous table movement.

Helical Multi-Slice Modes

Simplified scan prescriptions and easy-to-use default protocols make the

LightSpeed VCT/VCT XTe fast and efficient in patient set up.

Multi-slice acquisitions and short intergroup delays significantly reduce

potential mis-registration between scans by increasing the number of

scans possible in a patient breath hold.

Helical protocols are almost identical to “classical” axial scan protocols. At

the beginning of a study, the operator selects the type of exam with the

anatomical programmer, and indicates the desired scan range - either

manually, or from a Scout.

After completing the prescribed exam, the system remains ready to

continue with additional helical scans or a set of axial scans.

The operator may reconstruct helical scans prospectively with up to 90%

overlap, and retrospectively, at any arbitrary table location in 0.1 mm

increments.

Released

Rendered PDF File Page 8 of 37 DOC0306058, Rev:10

Product Data Sheet – Rev 10

July 6, 2009

Page 7/19

Option

†

May not be available in all markets

LightSpeed VCT

LightSpeed VCT / LightSpeed VCT XTe

GE Healthcare

Milwaukee, USA - Fax: 1 262 544 3384

Tokyo, Japan - Fax: 81 425 85 5490

Paris, France - Fax: 33 1 30 70 94 35

Prospective Multiple-Thickness Reconstruction

For all helical scan modes, the operator can choose to reconstruct images

prospectively in any of the defined nominal slice thicknesses.

In addition to the initial reconstructed slice thickness, the operator has the

option to prospectively specify additional images to be reconstructed from

a single raw data set. These images can be reconstructed at any of the

defined nominal slice thicknesses available for a given table speed and

scan mode.

This effectively facilitates later, more detailed image analysis without

additional patient scans and subsequent dose and image registration

concerns.

64-SLICE HELICAL MODES

Table Speed (mm/rotation)

Slice Thickness

(mm)

Nominal Pitch

0.516:1

0.984:1 1.375:1

0.625

1.25

2.5

3.75

mm/rot

Helical Scan Parameters

Scan Speeds: Full 360° rotational scans in 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0

seconds; Cardiac application: 0.35, 0.375, 0.40, 0.425, 0.45, 0.475, 0.50

Helical Pitch (nominal): 0.516:1, 0.984:1, 1.375:1

Cardiac Pitch: 0.16:1 to 0.24:1 for 0.35 second gantry speed. Up to

0.325:1 for slower gantry speeds.

Scan Technique:

 kVp: 80, 100, 120, 140

 mA: 10 to 600

†

/ 700 / 800, 5mA increments

 Power: 0.8 to 72

†

/ 85 / 100kW

 Focal Spot Selection @140kVp:

- Small spot for up to 46.9kW

- Large spot for greater than 46.9kW

Single Acquisition: 60-second scan maximum.

Multiple Acquisition Maximum Scan Time: Multiple scans may be acquired

in one series to produce up to 3,000 contiguous helical images. Up to 3,000

rotations helical coverage is possible in multiple series.

Minimum Inter-Group Delay (IGD): 5 seconds between adjacent helical

scans

Maximum Scan Fields of View:

- 32cm for pediatric head - 32cm for cardiac – small

- 32cm for pediatric body - 36cm for cardiac – medium

- 32cm for head, small - 50cm for cardiac – large

- 32cm for head

- 32cm for body, small

- 50cm for body, medium & large

Helical Scan Enhancements

Full simultaneity allows complete image display, processing and analysis,

as well as image archival and filming, concurrent with scanning and

reconstruction -- even when acquiring helical images in a multi-slice mode.

Confirm Rx to X-Rays on: < 18 seconds. for any state of tube and gantry; <

10 seconds. with the gantry rotating

Anatomical Programmer: a ten-region anatomical selector allows quick and

easy access to 90 user-programmable protocols per region. Separate

selector for adult and pediatric exams. There are four selection tabs to

select: GE, User, Service and Most Recent Patient. Copy/Paste is

supported for easy modification and copying of protocols.

Ten user-defined regions, each with one default protocol displayed with

the anatomical selector for very fast access to most commonly used

protocols.

Protocols include preset scan time, kVp, mA, scan mode, slice thickness

and spacing, table speed, scan FOV, display FOV and center, recon

algorithm and special image acquisition and processing options.

Any scan parameters may be edited for each scan or all scans - either

before or during an exam. The number of scans may also be easily

changed.

AutoScan™: Fully automates longitudinal table movement and start of

each scan.

AutoVoice™: 3 preset and 17 user-defined messages automatically deliver

patient breathing instructions with a programmable delay; especially

useful for multiple helical scanning.

Preset messages are supported in 9 different languages: Chinese, English

(Male/Female), French, German, Italian, Japanese, Korean, Spanish, and

Mexican Spanish.

Trauma Patient: Allows patient scans and image display/analysis without

entering patient data before scanning.

Advanced Artifact Reduction (AAR) Filter significantly reduces streaking

artifacts when highly absorbent objects are in the field of view – ie: large

shoulders.

Helical Image Reconstruction

Reconstruction Algorithms: Soft Tissue, Standard, Detail, Chest, Bone, Bone

Plus, Lung, and Edge

High-resolution cardiac reconstruction algorithm for stent visualization

provides 2x improvement of in-plane resolution.

Reconstruction Matrix: 512 x 512

Display Matrix: 1024 x 1024

Display FOV: Freely variable center/off-center, prospective/retrospective

target selection.

Preferred Viewing Orientation: Images may be reconstructed flipped

right/left, top/bottom, or right/left/top/bottom for anatomical viewing.

CT Number Scale: ±31,743 HU

Helical Reconstruction Times:

 Reconstruction time as fast as 35

images per second

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