[{"data":1,"prerenderedAt":262},["ShallowReactive",2],{"project-14869138":3},{"id":4,"name":5,"line":6,"line_source":7,"title":8,"url":9,"domain":10,"maker":11,"posted_at":12,"year":13,"points":14,"comments":15,"rank_in_year":16,"shown_in_year":17,"top":18,"tier":19,"category":20,"subcategory":21,"format":20,"keywords":22,"reception":27,"sentiment":28,"stance_mix":29,"scored_comments":34,"aspects":35,"strip":41,"post_text":43,"what":44,"said":84,"maker_in_thread":136,"shape":144,"grid":149,"attempts":224,"same_week":225,"maker_shows":30,"maker_hidden":254,"reader_version":255,"card":256},"14869138","EchoMods","Hacking an ultrasound probe with a Raspberry Pi and low-cost hardware","title","Show HN: Hacking an ultrasound probe with a Raspberry Pi and low-cost hardware","https:\u002F\u002Fkelu124.gitbooks.io\u002Fechomods\u002Fcontent\u002FRPI.html","kelu124.gitbooks.io","kelu124",1501187216,2017,227,31,127,2242,6,"notable","hardware","ultrasound hardware experiments",[23,24,25,26],"ultrasound","raspberry pi","piezo transducer","low-cost medical imaging","curious",0.155,{"positive":30,"neutral":31,"mixed":32,"critical":33},3,15,0,1,19,{"idea":36,"pricing":38,"design":39,"performance":40},{"positive":37,"critical":32},2,{"positive":32,"critical":32},{"positive":33,"critical":32},{"positive":32,"critical":33},[42,32,32,32,30,32,32,42,30,30,30,32,30,32,30,32,30,30,30,30,30,30,30,32,33,30,32,42,32,30,32],5,null,{"problem":45,"audience":52,"pricing":56,"motivation":62,"time_to_build":43,"stack":66,"openness":82,"stage":83,"team_size":82},{"value":46,"source":47,"evidence":48},"Ultrasound hardware is expensive; this is a low-cost dev kit for tinkerers to explore ultrasound","maker",[49],{"id":50,"by":11,"text":51},"14869903","Before trolling a bit, I remember the main costs don't come from hardware (though it definitely costs something) - rather for r&d, patents, and most of all proper certification,…",{"value":53,"source":47,"evidence":54},"Curious tinkerers",[55],{"id":50,"by":11,"text":51},{"value":57,"source":47,"evidence":58},"Pulser boards are quite expensive mainly due to high voltage; maker plans cheaper version",[59],{"id":60,"by":11,"text":61},"14869880","Hey! Theres a link for tindie in the doc. It's quote expensive, high voltage being the main reason, but I'm planning on reducing the costs and have a cheaper on-board extension…",{"value":63,"source":47,"evidence":64},"Dev kit to help curious tinkerers explore the topic",[65],{"id":50,"by":11,"text":51},[67,76],{"value":68,"source":47,"evidence":69},"Raspberry Pi",[70,72],{"id":71},"post",{"id":73,"by":74,"text":75},"14869835","anfractuosity","Wow that's really awesome, I'm just skimming the site at the moment, are you planning on selling the pulser boards etc. out of interest, if so roughly how much do they cost?",{"value":77,"source":47,"evidence":78},"Single-element piezo transducer",[79],{"id":80,"by":11,"text":81},"14872619","The point being that on these experiments, the sensor isn't an array of piezos, rather a single-element piezo. Cuts the costs (a fab invoices around 100-200e for such a sensor),…","unknown","prototype",{"praise":85,"objections":98,"requests":107,"questions":113,"alternatives":135},[86],{"value":87,"source":88,"evidence":89},"Very cool and enjoyable Raspberry Pi project","commenter",[90,94],{"id":91,"by":92,"text":93},"14869854","WestCoastJustin","Very cool. There was something on HN about a year ago about why ultrasound machines are so expensive. This might provide some background on why something low cost makes sense.…",{"id":95,"by":96,"text":97},"14869829","gadgetoid","Really enjoying this little bubble of Raspberry Pi content; it's close to my heart. Keep it up HN!",[99],{"value":100,"source":88,"evidence":101},"Single-element sensor lowers image quality compared with arrays",[102,103],{"id":80,"by":11,"text":81},{"id":104,"by":105,"text":106},"14872988","amelius","I wonder if two sensors placed at a distance can make a huge difference, and how\u002Fif the image quality converges as you increase sensors.",[108],{"value":109,"source":88,"evidence":110},"Pulser boards should be made cheaper",[111,112],{"id":73,"by":74,"text":75},{"id":60,"by":11,"text":61},[114,125],{"value":115,"source":88,"evidence":116},"Can off-the-shelf crystal oscillators be used as ultrasound transducers?",[117,121],{"id":118,"by":119,"text":120},"14872125","blensor","I have no idea how hackernews always reads my mind about this kind of things but I started thinking about this topic due to a personal interest a few days ago. And my question…",{"id":122,"by":123,"text":124},"14872318","wiml","I'd been thinking about this technology recently as well, but hadn't gotten any further than perusing data sheets a little. My impression is that quartz crystals as found in…",{"value":126,"source":88,"evidence":127},"Could rtl-sdr and rpitx be used?",[128,132],{"id":129,"by":130,"text":131},"14870060","ultrasdr","could rtl-sdrs and rpitx be used at all?",{"id":133,"by":11,"text":134},"14870093","It's been a question I'd love to be able to answer to!",[],{"comments":137,"answered":18,"key":138},8,[139,140,143],{"id":50,"text":51},{"id":141,"text":142},"14873669","I guess nothing prevents you from doing so :)",{"id":80,"text":81},{"commenters":145,"max_depth":146,"maker_replies":137,"first_comment_mins":147,"lifespan_hours":148},17,7,69,21,[150,152,154,157,161,164,166,169,171,175,178,181,182,183,186,189,191,192,193,195,198,201,203,206,209,212,214,215,219,222,223],[91,32,42,151,92,32],"project\u002Fpositive\u002Fidea",[50,32,32,153,11,33],"project\u002Fneutral\u002Fidea",[155,32,32,156,105,32],"14870016","commenter\u002Fneutral\u002Fidea",[158,32,32,159,160,32],"14872517","commenter\u002Fneutral\u002Fnone","Toenex",[162,32,30,153,163,32],"14872758","agumonkey",[141,32,32,165,11,33],"maker\u002Fneutral\u002Fidea",[167,32,32,159,168,32],"14874888","bluGill",[170,32,42,151,163,32],"14874978",[172,32,30,173,174,32],"14870400","project\u002Fneutral\u002Fpricing","tyingq",[176,32,30,153,177,32],"14870498","leggomylibro",[179,32,30,180,174,32],"14870902","project\u002Fneutral\u002Fdesign",[80,32,32,180,11,33],[104,32,30,180,105,32],[184,32,32,185,11,33],"14873699","maker\u002Fpositive\u002Fexecution",[187,32,30,180,188,32],"14873541","taneq",[95,33,32,190,96,32],"other\u002Fpositive\u002Fnone",[118,37,30,180,119,32],[122,37,30,180,123,32],[194,37,30,180,119,32],"14872953",[196,37,30,180,197,32],"14873612","awelkie",[199,37,30,200,119,32],"14874117","project\u002Fneutral\u002Fperformance",[202,37,30,200,197,32],"14874433",[204,30,30,153,205,32],"14873467","anotheryou",[207,30,32,208,11,33],"14875528","maker\u002Fpositive\u002Fidea",[210,30,33,211,205,32],"14875940","project\u002Fcritical\u002Fperformance",[73,213,30,173,74,32],4,[60,213,32,173,11,33],[216,42,42,217,218,32],"14871447","project\u002Fpositive\u002Fdesign","dchichkov",[220,42,32,221,11,33],"14873064","maker\u002Fneutral\u002Fnone",[129,18,30,153,130,32],[133,18,32,153,11,33],[],[226,231,236,241,245,250],{"id":227,"name":228,"points":229,"category":230},"14894653","TensorFire",564,"ai",{"id":232,"name":233,"points":234,"category":235},"14865043","The JavaScript Way",545,"learning_science",{"id":237,"name":238,"points":239,"category":240},"14911372","Bt",254,"languages",{"id":242,"name":243,"points":244,"category":240},"14896455","see-phit",175,{"id":246,"name":247,"points":248,"category":249},"14865666","Nuclino",133,"productivity",{"id":251,"name":252,"points":253,"category":235},"14865184","A 2D Physics Simulator in JavaScript",126,false,"v2",{"id":257,"name":5,"line":6,"ai":254,"cat":20,"year":13,"points":14,"comments":15,"rec":27,"s":258,"top":18,"kw":259,"maker":11,"domain":10,"tier":19,"attempts":32,"strip":260,"url":9,"mix":261,"praise":87,"objection":100,"sub":21},14869138,0.16,[23,24,25,26],"5000300533303030333333301305030",[30,31,32,33],1794036557709]