TI公司的手提超聲系統(tǒng)DSP解決方案重量大約10磅或不到10磅,可以在沒有電池的情況下工作. 手提超聲系統(tǒng)廣泛應(yīng)用于ICU病房,急診室, 麻醉和戰(zhàn)場. 手提超聲系統(tǒng)采用DSP和SoC來處理電傳感器(如照相機,變換器,麥克風(fēng)等)所產(chǎn)品生的數(shù)字化電信號,一個診斷超聲圖像系統(tǒng)產(chǎn)生和發(fā)送超聲波,捕捉反射波并轉(zhuǎn)換成可視的圖像.接收到的反射波的信號處理包內(nèi)插,抽取,數(shù)據(jù)濾波和重建.可編程的DSP和SoC能實時實現(xiàn)這些復(fù)雜的數(shù)學(xué)運算.本文介紹了超聲波系統(tǒng)方框圖, 超聲波系統(tǒng)的前端處理,中間處理和后端處理,以及由DM648 + DM6446組成的系統(tǒng)框圖和由C6455 + OMAP3530組成的系統(tǒng)方框圖.此外還介紹了相關(guān)處理器和應(yīng)用處理的主要特性和方框圖.

DSPs and SoCs are specially designed single-chip digital microcomputers that process digitized electrical signals generated by electronic sensors (e.g., cameras, transducers, microphones, etc.) that will help to revolutionize the area of diagnostic ultrasound imaging. A diagnostic ultrasound imaging system generates and transmits acoustic waves and captures reflections that are then transformed into visual images. The signal processing on the received acoustic waves include interpolation, decimation, data filtering and reconstruction. Programmable DSPs and SOCs, with architectures designed for implementing complex mathematical algorithms in real-time, can efficiently address all the processing needs of such a system.

TI Digital Signal Processor (DSP) for Portable Ultrasound

Portable ultrasound systems are considered to be ultrasound systems that weigh around 10 lbs or less, and can run on batteries. They began to appear in the market place in the late 90s and have seen a remarkable growth in sales in the recent years. This growth has been a direct result of their applicability in areas such as ICUs, emergency medicine, regional anesthesia and battlefield.

DSPs and SoCs are specially designed single-chip digital microcomputers that process digitized electrical signals generated by electronic sensors (e.g., cameras, transducers, microphones, etc.) that will help to revolutionize the area of diagnostic ultrasound imaging. A diagnostic ultrasound imaging system generates and transmits acoustic waves and captures reflections that are then transformed into visual images. The signal processing on the received acoustic waves include interpolation, decimation, data filtering and reconstruction. Programmable DSPs and SOCs, with architectures designed for implementing complex mathematical algorithms in real-time, can efficiently address all the processing needs of such a system.

The following information introduces the concept of a complete portable ultrasound system solution based on Texas Instruments (TI) semiconductor components, development tools, and software solutions.

Additionally, the various concepts that outline the inherent advantages of a DSP and a SoC in a portable ultrasound system - efficient signal processing, lower power consumption and lower cost, all leading to better ultrasound diagnostic imaging - will also be covered.

The key driver requirements for a portable ultrasound system are the same with any portable device: size, weight, battery life, cost and performance. OEMs are making trade-offs in these areas, for example, providing just a basic imaging system with less features but with more battery life, (e.g., 8-channel black and white systems vs. more sophisticated 128 channel color systems that would need to be re-charged more often). The size of the portable system varies from laptop sized systems to handhelds. These size limitations are driving the need for more system integration on the supporting SoCs and more automatic image enhancement features due to fewer fine controls.

The requirements for portable systems is also being driven from geographies where the infrastructure is more rural and access to the larger more sophisticated imaging systems is limited, and where clinicians must now take the system to the patient. This makes cost a critical factor as well.

圖1.超聲波系統(tǒng)方框圖

圖2.超聲波系統(tǒng)前端處理框圖

圖3.超聲波系統(tǒng)中間處理框圖

圖4.超聲波系統(tǒng)后端處理框圖

系統(tǒng)框圖案例:

1.

System block diagram highlighting the use of TMS320DM648 and TMS320DM6446 for carrying out mid-end, back-end, and system controller functions.

圖5.DM648 + DM6446系統(tǒng)框圖}

TMS320DM648性能介紹

TMS320DM648 – Well suited for medical imaging applications needing high-performance

processing, TMS320C64x+ DSPs – which include the TMS320DM648 – are the high-performance fixed-point DSPs in the TMS320C6000? DSP platform. DM647/DM648 devices are based on TI’s third-generation high-performance, advanced VelociTI? very long instruction word (VLIW) architecture. With performance of up to 7,200 MIPS at a clock rate of 900 MHz, the C64x+? DSP core offers a high-performance solution to a medical imaging processing challenge.

圖6.TMS320DM648方框圖

TMS320DM644x性能介紹

TMS320DM644x – Ideal for portable imaging applications, TMS320DM644x digital media processors are highly integrated SoCs that combine the power of an ARM926 processor and a TMS320C64x+? DSP core. The TMS320DM644x enables medical equipment OEMs and ODMs to quickly bring to market products featuring robust operating systems support, rich user interfaces, high processing performance and long battery life through the maximum flexibility of a fully integrated mixed-processor solution.

圖7.TMS320DM644x方框圖

2.

圖8.C6455 + OMAP3530系統(tǒng)方框圖

TMS320C6455性能介紹

A TMS320C6455 DSP is used here, with a wider EMIFA bus, which allows higher input data rates. Larger L2 memory and higher operating clock frequency are the major contributors to increased compute capability. In this example, the OMAP3530 plays the dual role of system controller and back-end processor.

The C6455 device is based on the third-generation high-performance, advanced VelociTI? very-long-instruction-word (VLIW) architecture developed by Texas Instruments (TI), making these DSPs an excellent choice for applications including video and telecom infrastructure, imaging/medical, and wireless infrastructure (WI). The C64x+? devices are upward code-compatible from previous devices that are part of the C6000? DSP platform.

Based on 90-nm process technology and with performance of up to 9600 million instructions per second (MIPS) [or 9600 16-bit MMACs per cycle] at a 1.2-GHz clock rate, the C6455 device offers cost-effective solutions to high-performance DSP programming challenges. The C6455 DSP possesses the operational flexibility of high-speed controllers and the numerical capability of array processors.

圖9.TMS320C6455方框圖

OMAP3515 和 OMAP3530性能介紹

The OMAP3515 and OMAP3530 processors are based on the enhanced OMAP?architecture, which features the superscalar ARM Cortex?-A8 processor, a 2-D/3-D graphics engine, high-performance DSP core and video accelerators to provide the best combination of general-purpose, graphics and video processing in a single chip. Combined with state-of-the-art power management techniques, these devices are well-suited for high-performance portable and handheld imaging applications such as portable ultrasound systems.

圖10. OMAP35x方框圖

Key Benchmarks

詳情請見:

http://focus.ti.com/lit/an/sprab18a/sprab18a.pdf

和

http://focus.ti.com/lit/wp/sprab12/sprab12.pdf

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