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ultrasound-imaging

Healthcare | ultrasound-imaging — ultrasound scanner software: transducer front end, delay-and-sum beamforming, B-mode envelope and scan conversion, colour and spectral Doppler, speckle reduction, real-time UI, DICOM export

GE Voluson/LOGIQ, Philips EPIQ, Siemens ACUSON, Butterfly iQ

SystemTechniques · 20Primitives · 97 ultrasound-imaging Deterministic simulation testingdistributed · medium: Run the whole system in one thread under a seeded scheduler with simulated network, disk and clock, so every failure replays from its seed.›Primary-backup replicationdistributed · medium: One node orders all writes and ships them to standbys; the acknowledgement rule (none, one, all) sets what a crash loses, and an external arbiter decides who takes over.›A/B partition updatesembedded · medium: Two bootable slots and a small atomic metadata block: write the new image to the idle slot, try it once, and fall back by itself unless it reports healthy.›Image segmentationmachine-learning · medium: Pixel/instance segmentation networks and promptable segmentation (Mask R-CNN, SAM-style)Image denoisingmedia · medium: Bilateral, non-local means and temporal noise reduction for sensor imagesLow latency video encodingmedia · medium: Video encoding tuned for latency: no B-frames, intra refresh, slice output, low-delay rate controlCoverage-guided fuzzingsecurity · medium: Mutate inputs, run an instrumented target, and keep any input that reaches a new code edge; feedback turns blind guessing into incremental search.›Convolutional networksml-training · low: Layers that slide a small shared kernel over a grid, giving translation equivariance and few parameters; still the most compute-efficient choice for many vision tasks.›Hdr histogramdata-structures · low: Log-linear bucketed histograms with bounded relative error for latency percentilesSPSC ring bufferdata-structures · low: Bounded wait-free queue for exactly one producer and one consumer thread, built from an array and two indices with acquire/release ordering.›Fixed-rate control loopembedded · low: Run a controller at an exact period using absolute deadlines and a fixed dt, so jitter never accumulates and the math stays valid.›Image resampling filtersgraphics · low: Resize an image by convolving with a kernel (box, triangle, cubic, Lanczos) whose width scales with the shrink factor, done as two separable 1-D passes with precomputed weights.›Process supervisionhardware-os · low: A parent process starts services, reaps their exits and restarts them under a delay and burst-limit policy, then stops them with SIGTERM before SIGKILL.›Image codecsmedia · low: JPEG (DCT, Huffman), PNG, HEIF/AVIF decoding and encoding fundamentalsScan conversion interpolationmedia · low: Convert polar acquisition lines to a Cartesian display grid with bilinear or higher-order interpolationVideo codecsmedia · low: H.264/HEVC/AV1 basics: frames, GOPs, hardware decode/encode APIs and latency settingsGPU compute shadersml-training · low: The vendor-neutral GPU launch model of Metal, Vulkan and WebGPU: a grid of workgroups, shared memory, barriers and subgroups, driven by recorded command buffers.›Weight quantizationml-training · low: Store weights as 8/4-bit integers with per-group scales; decode is memory-bound, so 4-bit weights give about 3-4x tokens/s and fit 4x larger models.›Dicom protocolnetworking · low: DICOM data elements, transfer syntaxes, DIMSE services (C-STORE, C-FIND) and DICOMwebFast Fourier transformnumerics · low: Computes the DFT in O(n log n) by recursively splitting into even and odd halves; the basis of fast convolution and spectral methods.›Spline interpolationnumerics · low: Linear, bilinear/trilinear and cubic spline interpolation on grids and tablesMutual TLSsecurity · low: TLS where the client also proves a certificate key, so every connection carries a verified, rotatable machine identity.›Beamformingsignal-processing · low: Phased-array weights that steer radio energy toward a receiver; per-client steering vectors+ 13 more techniques+ 81 more primitives

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